debug: disable DualAuth agent to test fastutil classloader issue

Temporarily skip -javaagent injection to determine if agent's
appendToBootstrapClassLoaderSearch() causes the fastutil
ClassNotFoundException on affected Windows systems.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -52,12 +52,20 @@ jobs:
         run: |
           RELEASE_ID=$(curl -s "${FORGEJO_API}/repos/${GITHUB_REPOSITORY}/releases/tags/${{ github.ref_name }}" \
             -H "Authorization: token ${{ secrets.RELEASE_TOKEN }}" | python3 -c 'import sys,json; print(json.load(sys.stdin)["id"])')
+          echo "Release ID: ${RELEASE_ID}"
+          echo "Upload URL: ${FORGEJO_UPLOAD}/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets"
           for file in dist/*.exe dist/*.exe.blockmap dist/latest.yml; do
             [ -f "$file" ] || continue
-            echo "Uploading $file..."
+            echo "Uploading $file ($(stat -c%s "$file" 2>/dev/null || stat -f%z "$file") bytes)..."
-            curl -s --max-time 600 -X POST "${FORGEJO_UPLOAD}/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=$(basename $file)" \
+            HTTP_CODE=$(curl -w '%{http_code}' --max-time 600 -X POST "${FORGEJO_UPLOAD}/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=$(basename $file)" \
               -H "Authorization: token ${{ secrets.RELEASE_TOKEN }}" \
-              -F "attachment=@${file}" || echo "Failed to upload $file"
+              -F "attachment=@${file}" -o /tmp/upload_response.txt 2>/tmp/upload_err.txt)
+            if [ "$HTTP_CODE" = "201" ]; then
+              echo "OK — uploaded $(basename $file)"
+            else
+              echo "FAILED (HTTP $HTTP_CODE): $(cat /tmp/upload_response.txt)"
+              echo "Curl stderr: $(cat /tmp/upload_err.txt)"
+            fi
           done
 
   build-macos:
@@ -83,12 +91,19 @@ jobs:
         run: |
           RELEASE_ID=$(curl -s "${FORGEJO_API}/repos/${GITHUB_REPOSITORY}/releases/tags/${{ github.ref_name }}" \
             -H "Authorization: token ${{ secrets.RELEASE_TOKEN }}" | python3 -c 'import sys,json; print(json.load(sys.stdin)["id"])')
+          echo "Release ID: ${RELEASE_ID}"
           for file in dist/*.dmg dist/*.zip dist/*.blockmap dist/latest-mac.yml; do
             [ -f "$file" ] || continue
             echo "Uploading $file..."
-            curl -s --max-time 600 -X POST "${FORGEJO_UPLOAD}/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=$(basename $file)" \
+            HTTP_CODE=$(curl -w '%{http_code}' --max-time 600 -X POST "${FORGEJO_UPLOAD}/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=$(basename $file)" \
               -H "Authorization: token ${{ secrets.RELEASE_TOKEN }}" \
-              -F "attachment=@${file}" || echo "Failed to upload $file"
+              -F "attachment=@${file}" -o /tmp/upload_response.txt 2>/tmp/upload_err.txt)
+            if [ "$HTTP_CODE" = "201" ]; then
+              echo "OK — uploaded $(basename $file)"
+            else
+              echo "FAILED (HTTP $HTTP_CODE): $(cat /tmp/upload_response.txt)"
+              echo "Curl stderr: $(cat /tmp/upload_err.txt)"
+            fi
           done
 
   build-linux:
@@ -113,10 +128,17 @@ jobs:
         run: |
           RELEASE_ID=$(curl -s "${FORGEJO_API}/repos/${GITHUB_REPOSITORY}/releases/tags/${{ github.ref_name }}" \
             -H "Authorization: token ${{ secrets.RELEASE_TOKEN }}" | python3 -c 'import sys,json; print(json.load(sys.stdin)["id"])')
+          echo "Release ID: ${RELEASE_ID}"
           for file in dist/*.AppImage dist/*.AppImage.blockmap dist/*.deb dist/*.rpm dist/*.pacman dist/latest-linux.yml; do
             [ -f "$file" ] || continue
-            echo "Uploading $file..."
+            echo "Uploading $file ($(stat -c%s "$file" 2>/dev/null || stat -f%z "$file") bytes)..."
-            curl -s --max-time 600 -X POST "${FORGEJO_UPLOAD}/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=$(basename $file)" \
+            HTTP_CODE=$(curl -w '%{http_code}' --max-time 600 -X POST "${FORGEJO_UPLOAD}/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=$(basename $file)" \
               -H "Authorization: token ${{ secrets.RELEASE_TOKEN }}" \
-              -F "attachment=@${file}" || echo "Failed to upload $file"
+              -F "attachment=@${file}" -o /tmp/upload_response.txt 2>/tmp/upload_err.txt)
+            if [ "$HTTP_CODE" = "201" ]; then
+              echo "OK — uploaded $(basename $file)"
+            else
+              echo "FAILED (HTTP $HTTP_CODE): $(cat /tmp/upload_response.txt)"
+              echo "Curl stderr: $(cat /tmp/upload_err.txt)"
+            fi
           done

GUI/index.html

@@ -73,22 +73,40 @@
                     <span id="onlineCount" class="counter-value">0</span>
                 </div>
 
+                <div class="identity-selector" id="identitySelector">
+                    <button class="identity-btn" onclick="toggleIdentityDropdown()">
+                        <i class="fas fa-id-badge"></i>
+                        <span id="currentIdentityName">Player</span>
+                        <i class="fas fa-chevron-down"></i>
+                    </button>
+                    <div class="identity-dropdown" id="identityDropdown">
+                        <div class="identity-list" id="identityList"></div>
+                        <div class="identity-divider"></div>
+                        <div class="identity-action" onclick="openIdentityManager()">
+                            <i class="fas fa-fingerprint"></i>
+                            <span data-i18n="header.manageIdentities">Manage</span>
+                        </div>
+                    </div>
+                    <span class="header-tooltip" data-i18n="header.identityTooltip">Your player name &amp; UUID used in-game</span>
+                </div>
+
                 <div class="profile-selector" id="profileSelector">
                     <button class="profile-btn" onclick="toggleProfileDropdown()">
-                        <i class="fas fa-user-circle"></i>
+                        <i class="fas fa-sliders-h"></i>
                         <span id="currentProfileName">Default</span>
                         <i class="fas fa-chevron-down"></i>
                     </button>
                     <div class="profile-dropdown" id="profileDropdown">
                         <div class="profile-list" id="profileList">
-                            <!-- Profiles populated by JS -->
+                            <!-- Configurations populated by JS -->
                         </div>
                         <div class="profile-divider"></div>
                         <div class="profile-action" onclick="openProfileManager()">
                             <i class="fas fa-cog"></i>
-                            <span data-i18n="header.manageProfiles">Manage Profiles</span>
+                            <span data-i18n="header.manageProfiles">Manage</span>
                         </div>
                     </div>
+                    <span class="header-tooltip" data-i18n="header.configTooltip">Game config: mods, Java &amp; memory settings</span>
                 </div>
 
                 <div class="window-controls">
@@ -574,6 +592,18 @@
                                                 </div>
                                             </label>
                                         </div>
+                                        <div class="settings-option">
+                                            <label class="settings-checkbox">
+                                                <input type="checkbox" id="allowMultiInstanceCheck" />
+                                                <span class="checkmark"></span>
+                                                <div class="checkbox-content">
+                                                    <div class="checkbox-title" data-i18n="settings.allowMultiInstance">Allow multiple game instances</div>
+                                                    <div class="checkbox-description" data-i18n="settings.allowMultiInstanceDescription">
+                                                        Allow running multiple game clients at the same time (useful for mod development)
+                                                    </div>
+                                                </div>
+                                            </label>
+                                        </div>
                                         <div class="settings-option">
                                             <label class="settings-checkbox">
                                                 <input type="checkbox" id="launcherHwAccelCheck" />
@@ -736,28 +766,40 @@
             </div>
 
             <div class="uuid-modal-body">
-                <div class="uuid-current-section">
-                    <h3 class="uuid-section-title" data-i18n="uuid.currentUserUUID">Current User UUID</h3>
-                    <div class="uuid-current-display">
-                        <input type="text" id="modalCurrentUuid" class="uuid-display-input" readonly />
-                        <button id="modalCopyUuidBtn" class="uuid-action-btn copy-btn" title="Copy UUID">
-                            <i class="fas fa-copy"></i>
-                        </button>
-                        <button id="modalRegenerateUuidBtn" class="uuid-action-btn regenerate-btn"
-                            title="Generate New UUID">
-                            <i class="fas fa-sync-alt"></i>
-                        </button>
-                    </div>
-                </div>
-
                 <div class="uuid-list-section">
                     <div class="uuid-list-header">
                         <h3 class="uuid-section-title" data-i18n="uuid.allPlayerUUIDs">All Player UUIDs</h3>
-                        <button id="generateNewUuidBtn" class="uuid-generate-btn">
+                        <button id="addIdentityBtn" class="uuid-generate-btn">
                             <i class="fas fa-plus"></i>
-                            <span data-i18n="uuid.generateNew">Generate New UUID</span>
+                            <span data-i18n="uuid.addIdentity">Add Identity</span>
                         </button>
                     </div>
+                    <div id="uuidAddForm" class="uuid-add-form" style="display: none;">
+                        <div class="uuid-add-form-row">
+                            <input type="text" id="addIdentityUsername" class="uuid-input"
+                                data-i18n-placeholder="uuid.usernamePlaceholder"
+                                placeholder="Username" maxlength="16" />
+                        </div>
+                        <div class="uuid-add-form-row">
+                            <input type="text" id="addIdentityUuid" class="uuid-input"
+                                data-i18n-placeholder="uuid.customPlaceholder"
+                                placeholder="UUID (auto-generated)" maxlength="36" />
+                            <button id="addIdentityRegenerateBtn" class="uuid-action-btn regenerate-btn"
+                                title="Generate new UUID">
+                                <i class="fas fa-sync-alt"></i>
+                            </button>
+                        </div>
+                        <div class="uuid-add-form-actions">
+                            <button id="addIdentityConfirmBtn" class="uuid-set-btn">
+                                <i class="fas fa-check"></i>
+                                <span data-i18n="uuid.add">Add</span>
+                            </button>
+                            <button id="addIdentityCancelBtn" class="uuid-cancel-btn">
+                                <i class="fas fa-times"></i>
+                                <span data-i18n="uuid.cancel">Cancel</span>
+                            </button>
+                        </div>
+                    </div>
                     <div id="uuidList" class="uuid-list">
                         <div class="uuid-loading">
                             <i class="fas fa-spinner fa-spin"></i>
@@ -766,21 +808,27 @@
                     </div>
                 </div>
 
-                <div class="uuid-custom-section">
+                <div class="uuid-advanced-section">
-                    <h3 class="uuid-section-title" data-i18n="uuid.setCustomUUID">Set Custom UUID</h3>
+                    <button id="uuidAdvancedToggle" class="uuid-advanced-toggle">
-                    <div class="uuid-custom-form">
+                        <i class="fas fa-chevron-right uuid-advanced-chevron"></i>
-                        <input type="text" id="customUuidInput" class="uuid-input"
+                        <span data-i18n="uuid.advanced">Advanced</span>
-                            data-i18n-placeholder="uuid.customPlaceholder" maxlength="36" />
+                    </button>
-                        <button id="setCustomUuidBtn" class="uuid-set-btn">
+                    <div id="uuidAdvancedContent" class="uuid-advanced-content" style="display: none;">
-                            <i class="fas fa-check"></i>
+                        <h3 class="uuid-section-title" data-i18n="uuid.setCustomUUID">Set Custom UUID</h3>
-                            <span data-i18n="uuid.setUUID">Set UUID</span>
+                        <div class="uuid-custom-form">
-                        </button>
+                            <input type="text" id="customUuidInput" class="uuid-input"
+                                data-i18n-placeholder="uuid.customPlaceholder" maxlength="36" />
+                            <button id="setCustomUuidBtn" class="uuid-set-btn">
+                                <i class="fas fa-check"></i>
+                                <span data-i18n="uuid.setUUID">Set UUID</span>
+                            </button>
+                        </div>
+                        <p class="uuid-custom-hint">
+                            <i class="fas fa-exclamation-triangle"></i>
+                            <span data-i18n="uuid.warning">Warning: Setting a custom UUID will change your current player
+                                identity</span>
+                        </p>
                     </div>
-                    <p class="uuid-custom-hint">
-                        <i class="fas fa-exclamation-triangle"></i>
-                        <span data-i18n="uuid.warning">Warning: Setting a custom UUID will change your current player
-                            identity</span>
-                    </p>
                 </div>
             </div>
         </div>
@@ -791,8 +839,8 @@
         <div class="profile-modal-content">
             <div class="profile-modal-header">
                 <h2 class="profile-modal-title">
-                    <i class="fas fa-users-cog mr-2"></i>
+                    <i class="fas fa-sliders-h mr-2"></i>
-                    <span data-i18n="profiles.modalTitle">Manage Profiles</span>
+                    <span data-i18n="configurations.modalTitle">Manage Configurations</span>
                 </h2>
                 <button class="modal-close-btn" onclick="closeProfileManager()">
                     <i class="fas fa-times"></i>
@@ -803,10 +851,10 @@
                     <!-- Populated by JS -->
                 </div>
                 <div class="profile-create-section">
-                    <input type="text" id="newProfileName" data-i18n-placeholder="profiles.newProfilePlaceholder"
+                    <input type="text" id="newProfileName" data-i18n-placeholder="configurations.newProfilePlaceholder"
                         class="profile-input" maxlength="20">
                     <button class="profile-create-btn" onclick="createNewProfile()">
-                        <i class="fas fa-plus"></i> <span data-i18n="profiles.createProfile">Create Profile</span>
+                        <i class="fas fa-plus"></i> <span data-i18n="configurations.createProfile">Create Configuration</span>
                     </button>
                 </div>
             </div>

GUI/js/launcher.js

@@ -35,13 +35,21 @@ export function setupLauncher() {
   // Initial Profile Load
   loadProfiles();
 
-  // Close dropdown on outside click
+  // Initial Identity Load
+  loadIdentities();
+
+  // Close dropdowns on outside click
   document.addEventListener('click', (e) => {
-    const selector = document.getElementById('profileSelector');
+    const profileSelector = document.getElementById('profileSelector');
-    if (selector && !selector.contains(e.target)) {
+    if (profileSelector && !profileSelector.contains(e.target)) {
       const dropdown = document.getElementById('profileDropdown');
       if (dropdown) dropdown.classList.remove('show');
     }
+    const identitySelector = document.getElementById('identitySelector');
+    if (identitySelector && !identitySelector.contains(e.target)) {
+      const dropdown = document.getElementById('identityDropdown');
+      if (dropdown) dropdown.classList.remove('show');
+    }
   });
 }
 
@@ -83,7 +91,7 @@ function renderProfileList(profiles, activeProfile) {
     managerList.innerHTML = profiles.map(p => `
             <div class="profile-manager-item ${p.id === activeProfile.id ? 'active' : ''}">
                 <div class="flex items-center gap-3">
-                    <i class="fas fa-user-circle text-xl text-gray-400"></i>
+                    <i class="fas fa-sliders-h text-xl text-gray-400"></i>
                     <div>
                         <div class="font-bold">${p.name}</div>
                         <div class="text-xs text-gray-500">ID: ${p.id.substring(0, 8)}...</div>
@@ -106,13 +114,6 @@ function updateCurrentProfileUI(profile) {
   }
 }
 
-window.toggleProfileDropdown = () => {
-  const dropdown = document.getElementById('profileDropdown');
-  if (dropdown) {
-    dropdown.classList.toggle('show');
-  }
-};
-
 window.openProfileManager = () => {
   const modal = document.getElementById('profileManagerModal');
   if (modal) {
@@ -146,7 +147,7 @@ window.createNewProfile = async () => {
 };
 
 window.deleteProfile = async (id) => {
-  if (!confirm('Are you sure you want to delete this profile? parameters and mods configuration will be lost.')) return;
+  if (!confirm('Are you sure you want to delete this configuration? Mod settings will be lost.')) return;
 
   try {
     await window.electronAPI.profile.delete(id);
@@ -160,7 +161,7 @@ window.deleteProfile = async (id) => {
 window.switchProfile = async (id) => {
   try {
     if (window.LauncherUI) window.LauncherUI.showProgress();
-    const switchingMsg = window.i18n ? window.i18n.t('progress.switchingProfile') : 'Switching Profile...';
+    const switchingMsg = window.i18n ? window.i18n.t('progress.switchingProfile') : 'Switching configuration...';
     if (window.LauncherUI) window.LauncherUI.updateProgress({ message: switchingMsg });
 
     await window.electronAPI.profile.activate(id);
@@ -179,7 +180,7 @@ window.switchProfile = async (id) => {
     if (dropdown) dropdown.classList.remove('show');
 
     if (window.LauncherUI) {
-      const switchedMsg = window.i18n ? window.i18n.t('progress.profileSwitched') : 'Profile Switched!';
+      const switchedMsg = window.i18n ? window.i18n.t('progress.profileSwitched') : 'Configuration switched!';
       window.LauncherUI.updateProgress({ message: switchedMsg });
       setTimeout(() => window.LauncherUI.hideProgress(), 1000);
     }
@@ -676,6 +677,121 @@ async function loadCustomJavaPath() {
   }
 }
 
+// ==========================================
+// IDENTITY SWITCHER
+// ==========================================
+
+function escapeHtml(text) {
+  const div = document.createElement('div');
+  div.textContent = text;
+  return div.innerHTML;
+}
+
+async function loadIdentities() {
+  try {
+    if (!window.electronAPI) return;
+
+    const nameEl = document.getElementById('currentIdentityName');
+
+    // Load current username
+    let currentUsername = 'Player';
+    if (window.electronAPI.loadUsername) {
+      const name = await window.electronAPI.loadUsername();
+      if (name) currentUsername = name;
+    }
+    if (nameEl) nameEl.textContent = currentUsername;
+
+    // Load all identities for dropdown
+    const list = document.getElementById('identityList');
+    if (!list || !window.electronAPI.getAllUuidMappings) return;
+
+    const mappings = await window.electronAPI.getAllUuidMappings();
+    renderIdentityList(mappings, currentUsername);
+  } catch (error) {
+    console.error('Failed to load identities:', error);
+  }
+}
+
+function renderIdentityList(mappings, currentUsername) {
+  const list = document.getElementById('identityList');
+  if (!list) return;
+
+  if (!mappings || mappings.length === 0) {
+    list.innerHTML = '<div class="identity-empty">No identities</div>';
+    return;
+  }
+
+  list.innerHTML = mappings.map(m => {
+    const safe = escapeHtml(m.username);
+    return `
+    <div class="identity-item ${m.username === currentUsername ? 'active' : ''}"
+         onclick="switchIdentity('${safe.replace(/'/g, "&#39;")}')">
+        <span>${safe}</span>
+        ${m.username === currentUsername ? '<i class="fas fa-check ml-auto"></i>' : ''}
+    </div>
+  `;
+  }).join('');
+}
+
+window.toggleIdentityDropdown = () => {
+  const dropdown = document.getElementById('identityDropdown');
+  if (dropdown) {
+    dropdown.classList.toggle('show');
+    // Close profile dropdown
+    const profileDropdown = document.getElementById('profileDropdown');
+    if (profileDropdown) profileDropdown.classList.remove('show');
+  }
+};
+
+window.openIdentityManager = () => {
+  // Close dropdown
+  const dropdown = document.getElementById('identityDropdown');
+  if (dropdown) dropdown.classList.remove('show');
+  // Open UUID modal from settings
+  if (window.openUuidModal) {
+    window.openUuidModal();
+  }
+};
+
+window.switchIdentity = async (username) => {
+  try {
+    if (!window.electronAPI || !window.electronAPI.saveUsername) return;
+
+    const result = await window.electronAPI.saveUsername(username);
+    if (result && result.success === false) {
+      throw new Error(result.error || 'Failed to switch identity');
+    }
+
+    // Refresh identity dropdown
+    await loadIdentities();
+
+    // Close dropdown
+    const dropdown = document.getElementById('identityDropdown');
+    if (dropdown) dropdown.classList.remove('show');
+
+    // Update settings page username field and UUID display
+    const settingsInput = document.getElementById('settingsPlayerName');
+    if (settingsInput) settingsInput.value = username;
+    if (window.loadCurrentUuid) window.loadCurrentUuid();
+
+  } catch (error) {
+    console.error('Failed to switch identity:', error);
+  }
+};
+
+// Make loadIdentities available globally for settings.js to call
+window.loadIdentities = loadIdentities;
+
+window.toggleProfileDropdown = () => {
+  const dropdown = document.getElementById('profileDropdown');
+  if (dropdown) {
+    dropdown.classList.toggle('show');
+    // Close identity dropdown
+    const identityDropdown = document.getElementById('identityDropdown');
+    if (identityDropdown) identityDropdown.classList.remove('show');
+  }
+};
+
 window.launch = launch;
 window.uninstallGame = uninstallGame;
 window.repairGame = repairGame;

GUI/js/settings.js

@@ -6,6 +6,7 @@ let browseJavaBtn;
 let settingsPlayerName;
 let discordRPCCheck;
 let closeLauncherCheck;
+let allowMultiInstanceCheck;
 let launcherHwAccelCheck;
 let gpuPreferenceRadios;
 let gameBranchRadios;
@@ -18,10 +19,15 @@ let regenerateUuidBtn;
 let manageUuidsBtn;
 let uuidModal;
 let uuidModalClose;
-let modalCurrentUuid;
+let addIdentityBtn;
-let modalCopyUuidBtn;
+let uuidAddForm;
-let modalRegenerateUuidBtn;
+let addIdentityUsername;
-let generateNewUuidBtn;
+let addIdentityUuid;
+let addIdentityRegenerateBtn;
+let addIdentityConfirmBtn;
+let addIdentityCancelBtn;
+let uuidAdvancedToggle;
+let uuidAdvancedContent;
 let uuidList;
 let customUuidInput;
 let setCustomUuidBtn;
@@ -166,6 +172,7 @@ function setupSettingsElements() {
   settingsPlayerName = document.getElementById('settingsPlayerName');
   discordRPCCheck = document.getElementById('discordRPCCheck');
   closeLauncherCheck = document.getElementById('closeLauncherCheck');
+  allowMultiInstanceCheck = document.getElementById('allowMultiInstanceCheck');
   launcherHwAccelCheck = document.getElementById('launcherHwAccelCheck');
   gpuPreferenceRadios = document.querySelectorAll('input[name="gpuPreference"]');
   gameBranchRadios = document.querySelectorAll('input[name="gameBranch"]');
@@ -180,10 +187,15 @@ function setupSettingsElements() {
   manageUuidsBtn = document.getElementById('manageUuidsBtn');
   uuidModal = document.getElementById('uuidModal');
   uuidModalClose = document.getElementById('uuidModalClose');
-  modalCurrentUuid = document.getElementById('modalCurrentUuid');
+  addIdentityBtn = document.getElementById('addIdentityBtn');
-  modalCopyUuidBtn = document.getElementById('modalCopyUuidBtn');
+  uuidAddForm = document.getElementById('uuidAddForm');
-  modalRegenerateUuidBtn = document.getElementById('modalRegenerateUuidBtn');
+  addIdentityUsername = document.getElementById('addIdentityUsername');
-  generateNewUuidBtn = document.getElementById('generateNewUuidBtn');
+  addIdentityUuid = document.getElementById('addIdentityUuid');
+  addIdentityRegenerateBtn = document.getElementById('addIdentityRegenerateBtn');
+  addIdentityConfirmBtn = document.getElementById('addIdentityConfirmBtn');
+  addIdentityCancelBtn = document.getElementById('addIdentityCancelBtn');
+  uuidAdvancedToggle = document.getElementById('uuidAdvancedToggle');
+  uuidAdvancedContent = document.getElementById('uuidAdvancedContent');
   uuidList = document.getElementById('uuidList');
   customUuidInput = document.getElementById('customUuidInput');
   setCustomUuidBtn = document.getElementById('setCustomUuidBtn');
@@ -208,6 +220,10 @@ function setupSettingsElements() {
     closeLauncherCheck.addEventListener('change', saveCloseLauncher);
   }
 
+  if (allowMultiInstanceCheck) {
+    allowMultiInstanceCheck.addEventListener('change', saveAllowMultiInstance);
+  }
+
   if (launcherHwAccelCheck) {
     launcherHwAccelCheck.addEventListener('change', saveLauncherHwAccel);
   }
@@ -230,16 +246,24 @@ function setupSettingsElements() {
     uuidModalClose.addEventListener('click', closeUuidModal);
   }
 
-  if (modalCopyUuidBtn) {
+  if (addIdentityBtn) {
-    modalCopyUuidBtn.addEventListener('click', copyCurrentUuid);
+    addIdentityBtn.addEventListener('click', showAddIdentityForm);
   }
 
-  if (modalRegenerateUuidBtn) {
+  if (addIdentityRegenerateBtn) {
-    modalRegenerateUuidBtn.addEventListener('click', regenerateCurrentUuid);
+    addIdentityRegenerateBtn.addEventListener('click', regenerateAddIdentityUuid);
   }
 
-  if (generateNewUuidBtn) {
+  if (addIdentityConfirmBtn) {
-    generateNewUuidBtn.addEventListener('click', generateNewUuid);
+    addIdentityConfirmBtn.addEventListener('click', confirmAddIdentity);
+  }
+
+  if (addIdentityCancelBtn) {
+    addIdentityCancelBtn.addEventListener('click', hideAddIdentityForm);
+  }
+
+  if (uuidAdvancedToggle) {
+    uuidAdvancedToggle.addEventListener('click', toggleAdvancedSection);
   }
 
   if (setCustomUuidBtn) {
@@ -397,6 +421,30 @@ async function loadCloseLauncher() {
   }
 }
 
+async function saveAllowMultiInstance() {
+  try {
+    if (window.electronAPI && window.electronAPI.saveAllowMultiInstance && allowMultiInstanceCheck) {
+      const enabled = allowMultiInstanceCheck.checked;
+      await window.electronAPI.saveAllowMultiInstance(enabled);
+    }
+  } catch (error) {
+    console.error('Error saving multi-instance setting:', error);
+  }
+}
+
+async function loadAllowMultiInstance() {
+  try {
+    if (window.electronAPI && window.electronAPI.loadAllowMultiInstance) {
+      const enabled = await window.electronAPI.loadAllowMultiInstance();
+      if (allowMultiInstanceCheck) {
+        allowMultiInstanceCheck.checked = enabled;
+      }
+    }
+  } catch (error) {
+    console.error('Error loading multi-instance setting:', error);
+  }
+}
+
 async function saveLauncherHwAccel() {
   try {
     if (window.electronAPI && window.electronAPI.saveLauncherHardwareAcceleration && launcherHwAccelCheck) {
@@ -467,6 +515,9 @@ async function savePlayerName() {
     // Also refresh the UUID list to update which entry is marked as current
     await loadAllUuids();
 
+    // Refresh header identity dropdown
+    if (window.loadIdentities) window.loadIdentities();
+
   } catch (error) {
     console.error('Error saving player name:', error);
     const errorMsg = window.i18n ? window.i18n.t('notifications.playerNameSaveFailed') : 'Failed to save player name';
@@ -566,6 +617,7 @@ async function loadAllSettings() {
   await loadCurrentUuid();
   await loadDiscordRPC();
   await loadCloseLauncher();
+  await loadAllowMultiInstance();
   await loadLauncherHwAccel();
   await loadGpuPreference();
   await loadVersionBranch();
@@ -630,7 +682,6 @@ async function loadCurrentUuid() {
       const uuid = await window.electronAPI.getCurrentUuid();
       if (uuid) {
         if (currentUuidDisplay) currentUuidDisplay.value = uuid;
-        if (modalCurrentUuid) modalCurrentUuid.value = uuid;
       }
     }
   } catch (error) {
@@ -640,7 +691,7 @@ async function loadCurrentUuid() {
 
 async function copyCurrentUuid() {
   try {
-    const uuid = currentUuidDisplay ? currentUuidDisplay.value : modalCurrentUuid?.value;
+    const uuid = currentUuidDisplay ? currentUuidDisplay.value : null;
     if (uuid && navigator.clipboard) {
       await navigator.clipboard.writeText(uuid);
       const msg = window.i18n ? window.i18n.t('notifications.uuidCopied') : 'UUID copied to clipboard!';
@@ -688,13 +739,13 @@ async function performRegenerateUuid() {
     const result = await window.electronAPI.resetCurrentUserUuid();
     if (result.success && result.uuid) {
       if (currentUuidDisplay) currentUuidDisplay.value = result.uuid;
-      if (modalCurrentUuid) modalCurrentUuid.value = result.uuid;
       const msg = window.i18n ? window.i18n.t('notifications.uuidGenerated') : 'New UUID generated successfully!';
       showNotification(msg, 'success');
 
       if (uuidModal && uuidModal.style.display !== 'none') {
         await loadAllUuids();
       }
+      if (window.loadIdentities) window.loadIdentities();
     } else {
       throw new Error(result.error || 'Failed to generate new UUID');
     }
@@ -717,6 +768,10 @@ async function openUuidModal() {
   }
 }
 
+// Expose globally so identity dropdown and Escape handler can use them
+window.openUuidModal = openUuidModal;
+window.loadCurrentUuid = loadCurrentUuid;
+
 function closeUuidModal() {
   if (uuidModal) {
     uuidModal.classList.remove('active');
@@ -725,6 +780,7 @@ function closeUuidModal() {
     }, 300);
   }
 }
+window.closeUuidModal = closeUuidModal;
 
 async function loadAllUuids() {
   try {
@@ -769,6 +825,9 @@ async function loadAllUuids() {
             <button class="uuid-item-btn copy" onclick="copyUuid('${mapping.uuid}')" title="Copy UUID">
               <i class="fas fa-copy"></i>
             </button>
+            ${mapping.isCurrent ? `<button class="uuid-item-btn regenerate" onclick="regenerateUuidForUser('${escapeHtml(mapping.username)}')" title="Regenerate UUID">
+              <i class="fas fa-sync-alt"></i>
+            </button>` : ''}
             ${!mapping.isCurrent ? `<button class="uuid-item-btn delete" onclick="deleteUuid('${escapeHtml(mapping.username)}')" title="Delete UUID">
               <i class="fas fa-trash"></i>
             </button>` : ''}
@@ -791,23 +850,119 @@ async function loadAllUuids() {
   }
 }
 
-async function generateNewUuid() {
+async function showAddIdentityForm() {
+  if (!uuidAddForm) return;
+  uuidAddForm.style.display = 'block';
+  if (addIdentityUsername) {
+    addIdentityUsername.value = '';
+    addIdentityUsername.focus();
+  }
+  if (addIdentityUuid) {
+    try {
+      if (window.electronAPI && window.electronAPI.generateNewUuid) {
+        const newUuid = await window.electronAPI.generateNewUuid();
+        if (newUuid) addIdentityUuid.value = newUuid;
+      }
+    } catch (e) {
+      console.error('Error pre-generating UUID:', e);
+    }
+  }
+  if (addIdentityBtn) addIdentityBtn.style.display = 'none';
+}
+
+function hideAddIdentityForm() {
+  if (uuidAddForm) uuidAddForm.style.display = 'none';
+  if (addIdentityBtn) addIdentityBtn.style.display = '';
+}
+
+async function regenerateAddIdentityUuid() {
   try {
     if (window.electronAPI && window.electronAPI.generateNewUuid) {
       const newUuid = await window.electronAPI.generateNewUuid();
-      if (newUuid) {
+      if (newUuid && addIdentityUuid) {
-        if (customUuidInput) customUuidInput.value = newUuid;
+        addIdentityUuid.value = newUuid;
-        const msg = window.i18n ? window.i18n.t('notifications.uuidGeneratedShort') : 'New UUID generated!';
-        showNotification(msg, 'success');
       }
     }
   } catch (error) {
-    console.error('Error generating new UUID:', error);
+    console.error('Error generating UUID:', error);
-    const msg = window.i18n ? window.i18n.t('notifications.uuidGenerateFailed') : 'Failed to generate new UUID';
+  }
+}
+
+async function confirmAddIdentity() {
+  try {
+    const username = addIdentityUsername ? addIdentityUsername.value.trim() : '';
+    const uuid = addIdentityUuid ? addIdentityUuid.value.trim() : '';
+
+    if (!username) {
+      const msg = window.i18n ? window.i18n.t('notifications.playerNameRequired') : 'Please enter a username';
+      showNotification(msg, 'error');
+      return;
+    }
+
+    if (username.length > 16) {
+      const msg = window.i18n ? window.i18n.t('notifications.playerNameTooLong') : 'Username must be 16 characters or less';
+      showNotification(msg, 'error');
+      return;
+    }
+
+    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
+    if (!uuid || !uuidRegex.test(uuid)) {
+      const msg = window.i18n ? window.i18n.t('notifications.uuidInvalidFormat') : 'Invalid UUID format';
+      showNotification(msg, 'error');
+      return;
+    }
+
+    if (window.electronAPI && window.electronAPI.setUuidForUser) {
+      const result = await window.electronAPI.setUuidForUser(username, uuid);
+      if (result.success) {
+        const msg = window.i18n ? window.i18n.t('notifications.identityAdded') : 'Identity added successfully!';
+        showNotification(msg, 'success');
+        hideAddIdentityForm();
+        await loadAllUuids();
+        if (window.loadIdentities) window.loadIdentities();
+      } else {
+        throw new Error(result.error || 'Failed to add identity');
+      }
+    }
+  } catch (error) {
+    console.error('Error adding identity:', error);
+    const msg = window.i18n ? window.i18n.t('notifications.identityAddFailed') : 'Failed to add identity';
     showNotification(msg, 'error');
   }
 }
 
+function toggleAdvancedSection() {
+  if (!uuidAdvancedContent || !uuidAdvancedToggle) return;
+  const isOpen = uuidAdvancedContent.style.display !== 'none';
+  uuidAdvancedContent.style.display = isOpen ? 'none' : 'block';
+  const chevron = uuidAdvancedToggle.querySelector('.uuid-advanced-chevron');
+  if (chevron) {
+    chevron.classList.toggle('open', !isOpen);
+  }
+}
+
+window.regenerateUuidForUser = async function (username) {
+  try {
+    const message = window.i18n ? window.i18n.t('confirm.regenerateUuidMessage') : 'Are you sure you want to generate a new UUID? This will change your player identity.';
+    const title = window.i18n ? window.i18n.t('confirm.regenerateUuidTitle') : 'Generate New UUID';
+    const confirmBtn = window.i18n ? window.i18n.t('confirm.regenerateUuidButton') : 'Generate';
+    const cancelBtn = window.i18n ? window.i18n.t('common.cancel') : 'Cancel';
+
+    showCustomConfirm(
+      message,
+      title,
+      async () => {
+        await performRegenerateUuid();
+      },
+      null,
+      confirmBtn,
+      cancelBtn
+    );
+  } catch (error) {
+    console.error('Error regenerating UUID:', error);
+  }
+};
+
 async function setCustomUuid() {
   try {
     if (!customUuidInput || !customUuidInput.value.trim()) {
@@ -865,13 +1020,13 @@ async function performSetCustomUuid(uuid) {
 
       if (result.success) {
         if (currentUuidDisplay) currentUuidDisplay.value = uuid;
-        if (modalCurrentUuid) modalCurrentUuid.value = uuid;
         if (customUuidInput) customUuidInput.value = '';
 
         const msg = window.i18n ? window.i18n.t('notifications.uuidSetSuccess') : 'Custom UUID set successfully!';
         showNotification(msg, 'success');
 
         await loadAllUuids();
+        if (window.loadIdentities) window.loadIdentities();
       } else {
         throw new Error(result.error || 'Failed to set custom UUID');
       }
@@ -950,6 +1105,9 @@ async function performSwitchToUsername(username) {
     // Refresh the UUID list to show new "Current" badge
     await loadAllUuids();
 
+    // Refresh header identity dropdown
+    if (window.loadIdentities) window.loadIdentities();
+
     const msg = window.i18n
       ? window.i18n.t('notifications.switchUsernameSuccess').replace('{username}', username)
       : `Switched to "${username}" successfully!`;
@@ -997,6 +1155,7 @@ async function performDeleteUuid(username) {
         const msg = window.i18n ? window.i18n.t('notifications.uuidDeleteSuccess') : 'UUID deleted successfully!';
         showNotification(msg, 'success');
         await loadAllUuids();
+        if (window.loadIdentities) window.loadIdentities();
       } else {
         throw new Error(result.error || 'Failed to delete UUID');
       }

GUI/js/ui.js

@@ -79,12 +79,18 @@ function setupWindowControls() {
   const header = document.querySelector('.header');
 
   const profileSelector = document.querySelector('.profile-selector');
+  const identitySelector = document.querySelector('.identity-selector');
 
   if (profileSelector) {
     profileSelector.style.pointerEvents = 'auto';
     profileSelector.style.zIndex = '10000';
   }
 
+  if (identitySelector) {
+    identitySelector.style.pointerEvents = 'auto';
+    identitySelector.style.zIndex = '10000';
+  }
+
   if (windowControls) {
     windowControls.style.pointerEvents = 'auto';
     windowControls.style.zIndex = '10000';
@@ -98,6 +104,9 @@ function setupWindowControls() {
     if (profileSelector) {
       profileSelector.style.webkitAppRegion = 'no-drag';
     }
+    if (identitySelector) {
+      identitySelector.style.webkitAppRegion = 'no-drag';
+    }
   }
 
   if (window.electronAPI) {
@@ -1109,4 +1118,50 @@ window.openDiscordExternal = function() {
 
 window.toggleMaximize = toggleMaximize;
 
+// Global Escape key handler for closing popups/modals/dropdowns
+document.addEventListener('keydown', (e) => {
+  if (e.key !== 'Escape') return;
+
+  // Custom confirm dialogs handle their own Escape — skip if one is open
+  if (document.querySelector('.custom-confirm-modal')) return;
+
+  // Close modals (highest priority)
+  const profileModal = document.getElementById('profileManagerModal');
+  if (profileModal && profileModal.style.display !== 'none') {
+    if (window.closeProfileManager) window.closeProfileManager();
+    return;
+  }
+
+  const uuidModal = document.getElementById('uuidModal');
+  if (uuidModal && uuidModal.style.display !== 'none') {
+    if (window.closeUuidModal) window.closeUuidModal();
+    return;
+  }
+
+  const discordModal = document.getElementById('discordPopupModal');
+  if (discordModal && discordModal.style.display !== 'none') {
+    discordModal.style.display = 'none';
+    return;
+  }
+
+  const versionModal = document.getElementById('versionSelectModal');
+  if (versionModal && versionModal.style.display !== 'none') {
+    versionModal.style.display = 'none';
+    return;
+  }
+
+  // Close dropdowns (lower priority)
+  const identityDropdown = document.getElementById('identityDropdown');
+  if (identityDropdown && identityDropdown.classList.contains('show')) {
+    identityDropdown.classList.remove('show');
+    return;
+  }
+
+  const profileDropdown = document.getElementById('profileDropdown');
+  if (profileDropdown && profileDropdown.classList.contains('show')) {
+    profileDropdown.classList.remove('show');
+    return;
+  }
+});
+
 document.addEventListener('DOMContentLoaded', setupUI);

GUI/locales/ar-SA.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "اللاعبون:",
-    "manageProfiles": "إدارة الملفات الشخصية",
+    "manageProfiles": "إدارة",
+    "manageIdentities": "إدارة",
+    "identityTooltip": "اسم اللاعب ومعرّف UUID المستخدمان في اللعبة",
+    "configTooltip": "إعدادات اللعبة: المودات، Java والذاكرة",
     "defaultProfile": "الافتراضي"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "سلوك المشغل",
     "closeOnStart": "إغلاق المشغل عند بدء اللعبة",
     "closeOnStartDescription": "إغلاق المشغل تلقائياً بعد تشغيل Hytale",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "تسريع الأجهزة (Hardware Acceleration)",
     "hwAccelDescription": "تفعيل تسريع الأجهزة للمشغل",
     "gameBranch": "فرع اللعبة",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "إدارة UUID",
-    "currentUserUUID": "UUID المستخدم الحالي",
     "allPlayerUUIDs": "جميع معرفات UUID للاعبين",
-    "generateNew": "إنشاء UUID جديد",
+    "addIdentity": "إضافة هوية",
+    "usernamePlaceholder": "اسم المستخدم",
+    "add": "إضافة",
+    "cancel": "إلغاء",
+    "advanced": "متقدم",
     "loadingUUIDs": "جاري تحميل الـ UUIDs...",
     "setCustomUUID": "تعيين UUID مخصص",
     "customPlaceholder": "أدخل UUID مخصص (الصيغة: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "نسخ UUID",
     "regenerateTooltip": "إنشاء UUID جديد"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "إدارة الملفات الشخصية",
+    "modalTitle": "إدارة التكوينات",
-    "newProfilePlaceholder": "اسم الملف الشخصي الجديد",
+    "newProfilePlaceholder": "اسم التكوين الجديد",
-    "createProfile": "إنشاء ملف شخصي"
+    "createProfile": "إنشاء تكوين"
   },
   "discord": {
     "notificationText": "انضم إلى مجتمعنا على ديسكورد!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "تم حفظ إعداد تسريع الأجهزة",
     "hwAccelSaveFailed": "فشل حفظ إعداد تسريع الأجهزة",
     "noUsername": "لم يتم تهيئة اسم مستخدم. يرجى حفظ اسم المستخدم أولاً.",
+    "identityAdded": "تمت إضافة الهوية بنجاح!",
+    "identityAddFailed": "فشل في إضافة الهوية",
     "switchUsernameSuccess": "تم التبديل إلى المستخدم \"{username}\" بنجاح!",
     "switchUsernameFailed": "فشل تبديل اسم المستخدم",
     "playerNameTooLong": "يجب أن يكون اسم اللاعب 16 حرفاً أو أقل"
@@ -247,8 +257,8 @@
     "installing": "جاري التثبيت...",
     "extracting": "جاري الاستخراج...",
     "verifying": "جاري التحقق...",
-    "switchingProfile": "جاري تبديل الملف الشخصي...",
+    "switchingProfile": "جاري تبديل التكوين...",
-    "profileSwitched": "تم تبديل الملف الشخصي!",
+    "profileSwitched": "تم تبديل التكوين!",
     "startingGame": "جاري بدء اللعبة...",
     "launching": "جاري التشغيل...",
     "uninstallingGame": "جاري إلغاء تثبيت اللعبة...",

GUI/locales/de-DE.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Spieler:",
-    "manageProfiles": "Profile verwalten",
+    "manageProfiles": "Verwalten",
+    "manageIdentities": "Verwalten",
+    "identityTooltip": "Dein Spielername und UUID im Spiel",
+    "configTooltip": "Spielkonfiguration: Mods, Java- und Speichereinstellungen",
     "defaultProfile": "Standard"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Launcher-Verhalten",
     "closeOnStart": "Launcher beim Spielstart schließen",
     "closeOnStartDescription": "Schließe den Launcher automatisch, nachdem Hytale gestartet wurde",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Hardware-Beschleunigung",
     "hwAccelDescription": "Hardware-Beschleunigung für den Launcher aktivieren",
     "gameBranch": "Spiel-Branch",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "UUID-Verwaltung",
-    "currentUserUUID": "Aktuelle Benutzer-UUID",
     "allPlayerUUIDs": "Alle Spieler-UUIDs",
-    "generateNew": "Neue UUID generieren",
+    "addIdentity": "Identität hinzufügen",
+    "usernamePlaceholder": "Benutzername",
+    "add": "Hinzufügen",
+    "cancel": "Abbrechen",
+    "advanced": "Erweitert",
     "loadingUUIDs": "UUIDs werden geladen...",
     "setCustomUUID": "Benutzerdefinierte UUID festlegen",
     "customPlaceholder": "Benutzerdefinierte UUID eingeben (Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "UUID kopieren",
     "regenerateTooltip": "Neue UUID generieren"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Profile verwalten",
+    "modalTitle": "Konfigurationen verwalten",
-    "newProfilePlaceholder": "Neuer Profilname",
+    "newProfilePlaceholder": "Neuer Konfigurationsname",
-    "createProfile": "Profil erstellen"
+    "createProfile": "Konfiguration erstellen"
   },
   "discord": {
     "notificationText": "Tritt unserer Discord-Community bei!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Hardware-Beschleunigungseinstellung gespeichert",
     "hwAccelSaveFailed": "Hardware-Beschleunigungseinstellung konnte nicht gespeichert werden",
     "noUsername": "Kein Benutzername konfiguriert. Bitte speichere zuerst deinen Benutzernamen.",
+    "identityAdded": "Identität erfolgreich hinzugefügt!",
+    "identityAddFailed": "Fehler beim Hinzufügen der Identität",
     "switchUsernameSuccess": "Erfolgreich zu \"{username}\" gewechselt!",
     "switchUsernameFailed": "Benutzername konnte nicht gewechselt werden",
     "playerNameTooLong": "Spielername darf maximal 16 Zeichen haben"
@@ -247,8 +257,8 @@
     "installing": "Installiere...",
     "extracting": "Entpacke...",
     "verifying": "Überprüfe...",
-    "switchingProfile": "Profil wird gewechselt...",
+    "switchingProfile": "Konfiguration wird gewechselt...",
-    "profileSwitched": "Profil gewechselt!",
+    "profileSwitched": "Konfiguration gewechselt!",
     "startingGame": "Spiel wird gestartet...",
     "launching": "STARTET...",
     "uninstallingGame": "Spiel wird deinstalliert...",

GUI/locales/en.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Players:",
-    "manageProfiles": "Manage Profiles",
+    "manageProfiles": "Manage",
+    "manageIdentities": "Manage",
+    "identityTooltip": "Your player name & UUID used in-game",
+    "configTooltip": "Game config: mods, Java & memory settings",
     "defaultProfile": "Default"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Launcher Behavior",
     "closeOnStart": "Close Launcher on game start",
     "closeOnStartDescription": "Automatically close the launcher after Hytale has launched",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Hardware Acceleration",
     "hwAccelDescription": "Enable hardware acceleration for the launcher",
     "gameBranch": "Game Branch",
@@ -162,21 +167,24 @@
   },
   "uuid": {
     "modalTitle": "UUID Management",
-    "currentUserUUID": "Current User UUID",
     "allPlayerUUIDs": "All Player UUIDs",
-    "generateNew": "Generate New UUID",
+    "addIdentity": "Add Identity",
+    "usernamePlaceholder": "Username",
+    "add": "Add",
+    "cancel": "Cancel",
+    "advanced": "Advanced",
     "loadingUUIDs": "Loading UUIDs...",
-    "setCustomUUID": "Set Custom UUID",
+    "setCustomUUID": "Set Custom UUID for Current User",
     "customPlaceholder": "Enter custom UUID (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
     "setUUID": "Set UUID",
     "warning": "Warning: Setting a custom UUID will change your current player identity",
     "copyTooltip": "Copy UUID",
     "regenerateTooltip": "Generate New UUID"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Manage Profiles",
+    "modalTitle": "Manage Configurations",
-    "newProfilePlaceholder": "New Profile Name",
+    "newProfilePlaceholder": "New Configuration Name",
-    "createProfile": "Create Profile"
+    "createProfile": "Create Configuration"
   },
   "discord": {
     "notificationText": "Join our Discord community!",
@@ -230,6 +238,8 @@
     "hwAccelSaved": "Hardware acceleration setting saved",
     "hwAccelSaveFailed": "Failed to save hardware acceleration setting",
     "noUsername": "No username configured. Please save your username first.",
+    "identityAdded": "Identity added successfully!",
+    "identityAddFailed": "Failed to add identity",
     "switchUsernameSuccess": "Switched to \"{username}\" successfully!",
     "switchUsernameFailed": "Failed to switch username",
     "playerNameTooLong": "Player name must be 16 characters or less",
@@ -266,8 +276,8 @@
     "installing": "Installing...",
     "extracting": "Extracting...",
     "verifying": "Verifying...",
-    "switchingProfile": "Switching profile...",
+    "switchingProfile": "Switching configuration...",
-    "profileSwitched": "Profile switched!",
+    "profileSwitched": "Configuration switched!",
     "startingGame": "Starting game...",
     "launching": "LAUNCHING...",
     "uninstallingGame": "Uninstalling game...",

GUI/locales/es-ES.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Jugadores:",
-    "manageProfiles": "Gestionar Perfiles",
+    "manageProfiles": "Gestionar",
+    "manageIdentities": "Gestionar",
+    "identityTooltip": "Tu nombre de jugador y UUID usados en el juego",
+    "configTooltip": "Configuración del juego: mods, Java y memoria",
     "defaultProfile": "Predeterminado"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Comportamiento del Launcher",
     "closeOnStart": "Cerrar Launcher al iniciar el juego",
     "closeOnStartDescription": "Cierra automáticamente el launcher después de que Hytale se haya iniciado",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Aceleración por Hardware",
     "hwAccelDescription": "Habilitar aceleración por hardware para el launcher",
     "gameBranch": "Rama del Juego",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "Gestión de UUID",
-    "currentUserUUID": "UUID del usuario actual",
     "allPlayerUUIDs": "Todos los UUIDs de jugadores",
-    "generateNew": "Generar nuevo UUID",
+    "addIdentity": "Añadir identidad",
+    "usernamePlaceholder": "Nombre de usuario",
+    "add": "Añadir",
+    "cancel": "Cancelar",
+    "advanced": "Avanzado",
     "loadingUUIDs": "Cargando UUIDs...",
     "setCustomUUID": "Establecer UUID personalizado",
     "customPlaceholder": "Ingresa un UUID personalizado (formato: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "Copiar UUID",
     "regenerateTooltip": "Generar nuevo UUID"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Gestionar perfiles",
+    "modalTitle": "Gestionar Configuraciones",
-    "newProfilePlaceholder": "Nombre del nuevo perfil",
+    "newProfilePlaceholder": "Nombre de la nueva configuración",
-    "createProfile": "Crear perfil"
+    "createProfile": "Crear Configuración"
   },
   "discord": {
     "notificationText": "¡Únete a nuestra comunidad de Discord!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Configuración de aceleración por hardware guardada",
     "hwAccelSaveFailed": "Error al guardar la configuración de aceleración por hardware",
     "noUsername": "No hay nombre de usuario configurado. Por favor, guarda tu nombre de usuario primero.",
+    "identityAdded": "¡Identidad añadida con éxito!",
+    "identityAddFailed": "Error al añadir identidad",
     "switchUsernameSuccess": "¡Cambiado a \"{username}\" con éxito!",
     "switchUsernameFailed": "Error al cambiar nombre de usuario",
     "playerNameTooLong": "El nombre del jugador debe tener 16 caracteres o menos"
@@ -247,8 +257,8 @@
     "installing": "Instalando...",
     "extracting": "Extrayendo...",
     "verifying": "Verificando...",
-    "switchingProfile": "Cambiando perfil...",
+    "switchingProfile": "Cambiando configuración...",
-    "profileSwitched": "¡Perfil cambiado!",
+    "profileSwitched": "¡Configuración cambiada!",
     "startingGame": "Iniciando juego...",
     "launching": "INICIANDO...",
     "uninstallingGame": "Desinstalando juego...",

GUI/locales/fr-FR.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Joueurs:",
-    "manageProfiles": "Gérer les Profils",
+    "manageProfiles": "Gérer",
+    "manageIdentities": "Gérer",
+    "identityTooltip": "Votre nom de joueur et UUID utilisés en jeu",
+    "configTooltip": "Configuration du jeu : mods, Java et mémoire",
     "defaultProfile": "Par défaut"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Comportement du Launcher",
     "closeOnStart": "Fermer le Launcher au démarrage du jeu",
     "closeOnStartDescription": "Fermer automatiquement le launcher après le lancement d'Hytale",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Accélération Matérielle",
     "hwAccelDescription": "Activer l'accélération matérielle pour le launcher",
     "gameBranch": "Branche du Jeu",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "Gestion UUID",
-    "currentUserUUID": "UUID Utilisateur Actuel",
     "allPlayerUUIDs": "Tous les UUIDs Joueurs",
-    "generateNew": "Générer Nouvel UUID",
+    "addIdentity": "Ajouter une identité",
+    "usernamePlaceholder": "Nom d'utilisateur",
+    "add": "Ajouter",
+    "cancel": "Annuler",
+    "advanced": "Avancé",
     "loadingUUIDs": "Chargement des UUIDs...",
     "setCustomUUID": "Définir UUID Personnalisé",
     "customPlaceholder": "Entrez UUID personnalisé (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "Copier UUID",
     "regenerateTooltip": "Générer Nouvel UUID"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Gérer les Profils",
+    "modalTitle": "Gérer les Configurations",
-    "newProfilePlaceholder": "Nom du Nouveau Profil",
+    "newProfilePlaceholder": "Nom de la Nouvelle Configuration",
-    "createProfile": "Créer un Profil"
+    "createProfile": "Créer une Configuration"
   },
   "discord": {
     "notificationText": "Rejoignez notre communauté Discord!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Paramètre d'accélération matérielle sauvegardé",
     "hwAccelSaveFailed": "Échec de la sauvegarde du paramètre d'accélération matérielle",
     "noUsername": "Aucun nom d'utilisateur configuré. Veuillez d'abord enregistrer votre nom d'utilisateur.",
+    "identityAdded": "Identité ajoutée avec succès !",
+    "identityAddFailed": "Échec de l'ajout de l'identité",
     "switchUsernameSuccess": "Basculé vers \"{username}\" avec succès!",
     "switchUsernameFailed": "Échec du changement de nom d'utilisateur",
     "playerNameTooLong": "Le nom du joueur doit comporter 16 caractères ou moins"
@@ -247,8 +257,8 @@
     "installing": "Installation...",
     "extracting": "Extraction...",
     "verifying": "Vérification...",
-    "switchingProfile": "Changement de profil...",
+    "switchingProfile": "Changement de configuration...",
-    "profileSwitched": "Profil changé!",
+    "profileSwitched": "Configuration changée !",
     "startingGame": "Démarrage du jeu...",
     "launching": "LANCEMENT...",
     "uninstallingGame": "Désinstallation du jeu...",

GUI/locales/id-ID.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Pemain:",
-    "manageProfiles": "Kelola Profil",
+    "manageProfiles": "Kelola",
+    "manageIdentities": "Kelola",
+    "identityTooltip": "Nama pemain & UUID yang digunakan dalam game",
+    "configTooltip": "Konfigurasi game: mod, Java & pengaturan memori",
     "defaultProfile": "Default"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Perilaku Launcher",
     "closeOnStart": "Tutup launcher saat game dimulai",
     "closeOnStartDescription": "Tutup launcher secara otomatis setelah Hytale diluncurkan",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Akselerasi Perangkat Keras",
     "hwAccelDescription": "Aktifkan akselerasi perangkat keras untuk launcher`",
     "gameBranch": "Cabang Game",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "Manajemen UUID",
-    "currentUserUUID": "UUID Pengguna Saat Ini",
     "allPlayerUUIDs": "Semua UUID Pemain",
-    "generateNew": "Hasilkan UUID Baru",
+    "addIdentity": "Tambah Identitas",
+    "usernamePlaceholder": "Nama Pengguna",
+    "add": "Tambah",
+    "cancel": "Batal",
+    "advanced": "Lanjutan",
     "loadingUUIDs": "Memuat UUID...",
     "setCustomUUID": "Setel UUID Kustom",
     "customPlaceholder": "Masukkan UUID kustom (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "Salin UUID",
     "regenerateTooltip": "Hasilkan UUID Baru"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Kelola Profil",
+    "modalTitle": "Kelola Konfigurasi",
-    "newProfilePlaceholder": "Nama Profil Baru",
+    "newProfilePlaceholder": "Nama Konfigurasi Baru",
-    "createProfile": "Buat Profil"
+    "createProfile": "Buat Konfigurasi"
   },
   "discord": {
     "notificationText": "Gabung komunitas Discord kami!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Pengaturan akselerasi perangkat keras disimpan",
     "hwAccelSaveFailed": "Gagal menyimpan pengaturan akselerasi perangkat keras",
     "noUsername": "Nama pengguna belum dikonfigurasi. Silakan simpan nama pengguna terlebih dahulu.",
+    "identityAdded": "Identitas berhasil ditambahkan!",
+    "identityAddFailed": "Gagal menambahkan identitas",
     "switchUsernameSuccess": "Berhasil beralih ke \"{username}\"!",
     "switchUsernameFailed": "Gagal beralih nama pengguna",
     "playerNameTooLong": "Nama pemain harus 16 karakter atau kurang"
@@ -247,8 +257,8 @@
     "installing": "Menginstal...",
     "extracting": "Mengekstrak...",
     "verifying": "Memverifikasi...",
-    "switchingProfile": "Beralih profil...",
+    "switchingProfile": "Beralih konfigurasi...",
-    "profileSwitched": "Profil dialihkan!",
+    "profileSwitched": "Konfigurasi dialihkan!",
     "startingGame": "Memulai game...",
     "launching": "MELUNCURKAN...",
     "uninstallingGame": "Menghapus instalasi game...",

GUI/locales/pl-PL.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Graczy:",
-    "manageProfiles": "Zarządzaj Profilami",
+    "manageProfiles": "Zarządzaj",
+    "manageIdentities": "Zarządzaj",
+    "identityTooltip": "Twoja nazwa gracza i UUID używane w grze",
+    "configTooltip": "Konfiguracja gry: mody, Java i ustawienia pamięci",
     "defaultProfile": "Domyślny"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Zachowanie Launchera",
     "closeOnStart": "Zamknij Launcher przy starcie gry",
     "closeOnStartDescription": "Automatycznie zamknij launcher po uruchomieniu Hytale",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Przyspieszenie Sprzętowe",
     "hwAccelDescription": "Włącz przyspieszenie sprzętowe dla launchera",
     "gameBranch": "Gałąź Gry",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "Zarządzanie UUID",
-    "currentUserUUID": "Aktualny UUID użytkownika",
     "allPlayerUUIDs": "Wszystkie identyfikatory UUID graczy",
-    "generateNew": "Wygeneruj nowy UUID",
+    "addIdentity": "Dodaj tożsamość",
+    "usernamePlaceholder": "Nazwa użytkownika",
+    "add": "Dodaj",
+    "cancel": "Anuluj",
+    "advanced": "Zaawansowane",
     "loadingUUIDs": "Ładowanie UUID...",
     "setCustomUUID": "Ustaw niestandardowy UUID",
     "customPlaceholder": "Wprowadź niestandardowy UUID (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "Kopiuj UUID",
     "regenerateTooltip": "Wygeneruj nowy UUID"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Zarządzaj Profilami",
+    "modalTitle": "Zarządzaj Konfiguracjami",
-    "newProfilePlaceholder": "Nowa Nazwa Profilu",
+    "newProfilePlaceholder": "Nazwa Nowej Konfiguracji",
-    "createProfile": "Utwórz Profil"
+    "createProfile": "Utwórz Konfigurację"
   },
   "discord": {
     "notificationText": "Dołącz do naszej społeczności Discord!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Zapisano ustawienie przyspieszenia sprzętowego",
     "hwAccelSaveFailed": "Nie udało się zapisać ustawienia przyspieszenia sprzętowego",
     "noUsername": "Nie skonfigurowano nazwy użytkownika. Najpierw zapisz swoją nazwę użytkownika.",
+    "identityAdded": "Tożsamość dodana pomyślnie!",
+    "identityAddFailed": "Nie udało się dodać tożsamości",
     "switchUsernameSuccess": "Pomyślnie przełączono na \"{username}\"!",
     "switchUsernameFailed": "Nie udało się przełączyć nazwy użytkownika",
     "playerNameTooLong": "Nazwa gracza musi mieć 16 znaków lub mniej"
@@ -247,8 +257,8 @@
     "installing": "Instalowanie...",
     "extracting": "Ekstraktowanie...",
     "verifying": "Weryfikowanie...",
-    "switchingProfile": "Przełączanie profilu...",
+    "switchingProfile": "Przełączanie konfiguracji...",
-    "profileSwitched": "Profil zmieniony!",
+    "profileSwitched": "Konfiguracja zmieniona!",
     "startingGame": "Uruchamianie gry...",
     "launching": "URUCHAMIANIE...",
     "uninstallingGame": "Odinstalowywanie gry...",

GUI/locales/pt-BR.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Jogadores:",
-    "manageProfiles": "Gerenciar Perfis",
+    "manageProfiles": "Gerenciar",
+    "manageIdentities": "Gerenciar",
+    "identityTooltip": "Seu nome de jogador e UUID usados no jogo",
+    "configTooltip": "Configuração do jogo: mods, Java e memória",
     "defaultProfile": "Padrão"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Comportamento do Lançador",
     "closeOnStart": "Fechar Lançador ao iniciar o jogo",
     "closeOnStartDescription": "Fechar automaticamente o lançador após o Hytale ter sido iniciado",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Aceleração de Hardware",
     "hwAccelDescription": "Ativar aceleração de hardware para o lançador",
     "gameBranch": "Versão do Jogo",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "Gerenciamento de UUID",
-    "currentUserUUID": "UUID do usuário atual",
     "allPlayerUUIDs": "Todos os UUIDs de jogadores",
-    "generateNew": "Gerar novo UUID",
+    "addIdentity": "Adicionar identidade",
+    "usernamePlaceholder": "Nome de usuário",
+    "add": "Adicionar",
+    "cancel": "Cancelar",
+    "advanced": "Avançado",
     "loadingUUIDs": "Carregando UUIDs...",
     "setCustomUUID": "Definir UUID personalizado",
     "customPlaceholder": "Digite um UUID personalizado (formato: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "Copiar UUID",
     "regenerateTooltip": "Gerar novo UUID"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Gerenciar perfis",
+    "modalTitle": "Gerenciar Configurações",
-    "newProfilePlaceholder": "Nome do novo perfil",
+    "newProfilePlaceholder": "Nome da Nova Configuração",
-    "createProfile": "Criar perfil"
+    "createProfile": "Criar Configuração"
   },
   "discord": {
     "notificationText": "Junte-se à nossa comunidade do Discord!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Configuração de aceleração de hardware salva",
     "hwAccelSaveFailed": "Falha ao salvar configuração de aceleração de hardware",
     "noUsername": "Nenhum nome de usuário configurado. Por favor, salve seu nome de usuário primeiro.",
+    "identityAdded": "Identidade adicionada com sucesso!",
+    "identityAddFailed": "Falha ao adicionar identidade",
     "switchUsernameSuccess": "Alterado para \"{username}\" com sucesso!",
     "switchUsernameFailed": "Falha ao trocar nome de usuário",
     "playerNameTooLong": "O nome do jogador deve ter 16 caracteres ou menos"
@@ -247,8 +257,8 @@
     "installing": "Instalando...",
     "extracting": "Extraindo...",
     "verifying": "Verificando...",
-    "switchingProfile": "Alternando perfil...",
+    "switchingProfile": "Alternando configuração...",
-    "profileSwitched": "Perfil alternado!",
+    "profileSwitched": "Configuração alternada!",
     "startingGame": "Iniciando jogo...",
     "launching": "INICIANDO...",
     "uninstallingGame": "Desinstalando jogo...",

GUI/locales/ru-RU.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Игроки:",
-    "manageProfiles": "Управлять профилями:",
+    "manageProfiles": "Управление",
+    "manageIdentities": "Управление",
+    "identityTooltip": "Ваш игровой ник и UUID, используемые в игре",
+    "configTooltip": "Конфигурация игры: моды, Java и настройки памяти",
     "defaultProfile": "По умолчанию"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Поведение лаунчера",
     "closeOnStart": "Закрыть лаунчер при старте игры",
     "closeOnStartDescription": "Автоматически закрыть лаунчер после запуска Hytale",
+    "allowMultiInstance": "Несколько копий игры",
+    "allowMultiInstanceDescription": "Разрешить запуск нескольких клиентов одновременно (полезно для разработки модов)",
     "hwAccel": "Аппаратное ускорение",
     "hwAccelDescription": "Включить аппаратное ускорение для лаунчера",
     "gameBranch": "Ветка игры",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "Управление UUID",
-    "currentUserUUID": "UUID текущего пользователя",
     "allPlayerUUIDs": "UUID всех игроков",
-    "generateNew": "Сгенерировать новый UUID",
+    "addIdentity": "Добавить личность",
+    "usernamePlaceholder": "Имя пользователя",
+    "add": "Добавить",
+    "cancel": "Отмена",
+    "advanced": "Дополнительно",
     "loadingUUIDs": "Загрузка UUID...",
     "setCustomUUID": "Установить кастомный UUID",
     "customPlaceholder": "Ввести кастомный UUID (форматы: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "Скопировать UUID",
     "regenerateTooltip": "Сгенерировать новый UUID"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Управление профилями",
+    "modalTitle": "Управление конфигурациями",
-    "newProfilePlaceholder": "Новое имя профиля",
+    "newProfilePlaceholder": "Название новой конфигурации",
-    "createProfile": "Создать профиль"
+    "createProfile": "Создать конфигурацию"
   },
   "discord": {
     "notificationText": "Присоединитесь к нашему сообществу в Discord!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Настройка аппаратного ускорения сохранена!",
     "hwAccelSaveFailed": "Не удалось сохранить настройку аппаратного ускорения",
     "noUsername": "Имя пользователя не настроено. Пожалуйста, сначала сохраните имя пользователя.",
+    "identityAdded": "Личность успешно добавлена!",
+    "identityAddFailed": "Не удалось добавить личность",
     "switchUsernameSuccess": "Успешно переключено на \"{username}\"!",
     "switchUsernameFailed": "Не удалось переключить имя пользователя",
     "playerNameTooLong": "Имя игрока должно быть не более 16 символов"
@@ -247,8 +257,8 @@
     "installing": "Установка...",
     "extracting": "Извлечение...",
     "verifying": "Проверка...",
-    "switchingProfile": "Смена профиля...",
+    "switchingProfile": "Смена конфигурации...",
-    "profileSwitched": "Профиль сменён!",
+    "profileSwitched": "Конфигурация изменена!",
     "startingGame": "Запуск игры...",
     "launching": "ЗАПУСК...",
     "uninstallingGame": "Удаление игры...",

GUI/locales/sv-SE.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Spelare:",
-    "manageProfiles": "Hantera profiler",
+    "manageProfiles": "Hantera",
+    "manageIdentities": "Hantera",
+    "identityTooltip": "Ditt spelarnamn och UUID som används i spelet",
+    "configTooltip": "Spelkonfiguration: moddar, Java- och minnesinställningar",
     "defaultProfile": "Standard"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Launcher-beteende",
     "closeOnStart": "Stäng launcher vid spelstart",
     "closeOnStartDescription": "Stäng automatiskt launcher efter att Hytale har startats",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Hårdvaruacceleration",
     "hwAccelDescription": "Aktivera hårdvaruacceleration för launchern",
     "gameBranch": "Spelgren",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "UUID-hantering",
-    "currentUserUUID": "Nuvarande användar-UUID",
     "allPlayerUUIDs": "Alla spelare-UUID:er",
-    "generateNew": "Generera ny UUID",
+    "addIdentity": "Lägg till identitet",
+    "usernamePlaceholder": "Användarnamn",
+    "add": "Lägg till",
+    "cancel": "Avbryt",
+    "advanced": "Avancerat",
     "loadingUUIDs": "Laddar UUID:er...",
     "setCustomUUID": "Ange anpassad UUID",
     "customPlaceholder": "Ange anpassad UUID (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "Kopiera UUID",
     "regenerateTooltip": "Generera ny UUID"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Hantera profiler",
+    "modalTitle": "Hantera konfigurationer",
-    "newProfilePlaceholder": "Nytt profilnamn",
+    "newProfilePlaceholder": "Nytt konfigurationsnamn",
-    "createProfile": "Skapa profil"
+    "createProfile": "Skapa konfiguration"
   },
   "discord": {
     "notificationText": "Gå med i vår Discord-gemenskap!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Hårdvaruaccelerationsinställning sparad",
     "hwAccelSaveFailed": "Misslyckades med att spara hårdvaruaccelerationsinställning",
     "noUsername": "Inget användarnamn konfigurerat. Vänligen spara ditt användarnamn först.",
+    "identityAdded": "Identitet tillagd!",
+    "identityAddFailed": "Kunde inte lägga till identitet",
     "switchUsernameSuccess": "Bytte till \"{username}\" framgångsrikt!",
     "switchUsernameFailed": "Misslyckades med att byta användarnamn",
     "playerNameTooLong": "Spelarnamnet måste vara 16 tecken eller mindre"
@@ -247,8 +257,8 @@
     "installing": "Installerar...",
     "extracting": "Extraherar...",
     "verifying": "Verifierar...",
-    "switchingProfile": "Byter profil...",
+    "switchingProfile": "Byter konfiguration...",
-    "profileSwitched": "Profil bytt!",
+    "profileSwitched": "Konfiguration bytt!",
     "startingGame": "Startar spel...",
     "launching": "STARTAR...",
     "uninstallingGame": "Avinstallerar spel...",

GUI/locales/tr-TR.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Oyuncular:",
-    "manageProfiles": "Profilleri Yönet",
+    "manageProfiles": "Yönet",
+    "manageIdentities": "Yönet",
+    "identityTooltip": "Oyun içinde kullanılan oyuncu adınız ve UUID'niz",
+    "configTooltip": "Oyun yapılandırması: modlar, Java ve bellek ayarları",
     "defaultProfile": "Varsayılan"
   },
   "install": {
@@ -137,6 +140,8 @@
     "closeLauncher": "Başlatıcı Davranışı",
     "closeOnStart": "Oyun başlatıldığında Başlatıcıyı Kapat",
     "closeOnStartDescription": "Hytale başlatıldıktan sonra başlatıcıyı otomatik olarak kapatın",
+    "allowMultiInstance": "Allow multiple game instances",
+    "allowMultiInstanceDescription": "Allow running multiple game clients at the same time (useful for mod development)",
     "hwAccel": "Donanım Hızlandırma",
     "hwAccelDescription": "Başlatıcı için donanım hızlandırmasını etkinleştir",
     "gameBranch": "Oyun Dalı",
@@ -151,9 +156,12 @@
   },
   "uuid": {
     "modalTitle": "UUID Yönetimi",
-    "currentUserUUID": "Geçerli Kullanıcı UUID",
     "allPlayerUUIDs": "Tüm Oyuncu UUID'leri",
-    "generateNew": "Yeni UUID Oluştur",
+    "addIdentity": "Kimlik Ekle",
+    "usernamePlaceholder": "Kullanıcı Adı",
+    "add": "Ekle",
+    "cancel": "İptal",
+    "advanced": "Gelişmiş",
     "loadingUUIDs": "UUID'ler yükleniyor...",
     "setCustomUUID": "Özel UUID Ayarla",
     "customPlaceholder": "Özel UUID girin (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
@@ -162,10 +170,10 @@
     "copyTooltip": "UUID'yi Kopyala",
     "regenerateTooltip": "Yeni UUID Oluştur"
   },
-  "profiles": {
+  "configurations": {
-    "modalTitle": "Profilleri Yönet",
+    "modalTitle": "Yapılandırmaları Yönet",
-    "newProfilePlaceholder": "Yeni Profil Adı",
+    "newProfilePlaceholder": "Yeni Yapılandırma Adı",
-    "createProfile": "Profil Oluştur"
+    "createProfile": "Yapılandırma Oluştur"
   },
   "discord": {
     "notificationText": "Discord topluluğumuza katılın!",
@@ -219,6 +227,8 @@
     "hwAccelSaved": "Donanım hızlandırma ayarı kaydedildi",
     "hwAccelSaveFailed": "Donanım hızlandırma ayarı kaydedilemedi",
     "noUsername": "Kullanıcı adı yapılandırılmadı. Lütfen önce kullanıcı adınızı kaydedin.",
+    "identityAdded": "Kimlik başarıyla eklendi!",
+    "identityAddFailed": "Kimlik eklenemedi",
     "switchUsernameSuccess": "\"{username}\" adına başarıyla geçildi!",
     "switchUsernameFailed": "Kullanıcı adı değiştirilemedi",
     "playerNameTooLong": "Oyuncu adı 16 karakter veya daha az olmalıdır"
@@ -247,8 +257,8 @@
     "installing": "Kuruluyur...",
     "extracting": "Ayıklanıyor...",
     "verifying": "Doğrulanıyor...",
-    "switchingProfile": "Profil değiştiriliyor...",
+    "switchingProfile": "Yapılandırma değiştiriliyor...",
-    "profileSwitched": "Profil değiştirildi!",
+    "profileSwitched": "Yapılandırma değiştirildi!",
     "startingGame": "Oyun başlatılıyor...",
     "launching": "BAŞLATILIYOR...",
     "uninstallingGame": "Oyun kaldırılıyor...",

GUI/style.css

@@ -5575,9 +5575,8 @@ input[type="text"].uuid-input,
     font-family: 'Space Grotesk', sans-serif;
 }
 
-.uuid-current-section,
 .uuid-list-section,
-.uuid-custom-section {
+.uuid-advanced-section {
     background: rgba(255, 255, 255, 0.03);
     border: 1px solid rgba(255, 255, 255, 0.1);
     border-radius: 12px;
@@ -5824,6 +5823,96 @@ input[type="text"].uuid-input,
     color: #3b82f6;
 }
 
+.uuid-item-btn.regenerate:hover {
+    background: rgba(249, 115, 22, 0.2);
+    border-color: rgba(249, 115, 22, 0.4);
+    color: #f97316;
+}
+
+/* Add Identity Form */
+.uuid-add-form {
+    background: rgba(147, 51, 234, 0.05);
+    border: 1px dashed rgba(147, 51, 234, 0.3);
+    border-radius: 8px;
+    padding: 1rem;
+    margin-bottom: 0.75rem;
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+}
+
+.uuid-add-form-row {
+    display: flex;
+    align-items: stretch;
+    gap: 0.5rem;
+}
+
+.uuid-add-form-row .uuid-input {
+    flex: 1;
+    padding: 0.75rem 1rem;
+    border-radius: 8px;
+}
+
+.uuid-add-form-actions {
+    display: flex;
+    gap: 0.5rem;
+    justify-content: flex-end;
+}
+
+.uuid-cancel-btn {
+    padding: 0.75rem 1.25rem;
+    background: rgba(255, 255, 255, 0.05);
+    border: 1px solid rgba(255, 255, 255, 0.2);
+    border-radius: 8px;
+    color: rgba(255, 255, 255, 0.7);
+    font-size: 0.875rem;
+    font-weight: 600;
+    cursor: pointer;
+    transition: all 0.3s ease;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+}
+
+.uuid-cancel-btn:hover {
+    background: rgba(239, 68, 68, 0.15);
+    border-color: rgba(239, 68, 68, 0.3);
+    color: #ef4444;
+}
+
+/* Advanced Section */
+.uuid-advanced-toggle {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    background: none;
+    border: none;
+    color: rgba(255, 255, 255, 0.6);
+    font-size: 0.9rem;
+    font-weight: 600;
+    cursor: pointer;
+    padding: 0.5rem 0;
+    transition: color 0.3s ease;
+    font-family: 'Space Grotesk', sans-serif;
+}
+
+.uuid-advanced-toggle:hover {
+    color: rgba(255, 255, 255, 0.9);
+}
+
+.uuid-advanced-chevron {
+    font-size: 0.75rem;
+    transition: transform 0.3s ease;
+}
+
+.uuid-advanced-chevron.open {
+    transform: rotate(90deg);
+}
+
+.uuid-advanced-content {
+    margin-top: 1rem;
+}
+
 @media (max-width: 600px) {
     .uuid-modal-content {
         width: 95vw;
@@ -5835,8 +5924,8 @@ input[type="text"].uuid-input,
         gap: 1.5rem;
     }
 
-    .uuid-current-display,
+    .uuid-custom-form,
-    .uuid-custom-form {
+    .uuid-add-form-row {
         flex-direction: column;
     }
 
@@ -6213,6 +6302,155 @@ input[type="text"].uuid-input,
     box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
 }
 
+/* Header Tooltip Styles */
+.header-tooltip {
+    position: absolute;
+    top: 100%;
+    left: 50%;
+    transform: translateX(-50%) translateY(4px);
+    font-size: 0.65rem;
+    font-weight: 500;
+    letter-spacing: 0.03em;
+    color: #9ca3af;
+    opacity: 0;
+    transition: opacity 0.2s ease;
+    pointer-events: none;
+    white-space: nowrap;
+    background: rgba(0, 0, 0, 0.85);
+    padding: 0.3rem 0.6rem;
+    border-radius: 6px;
+    border: 1px solid rgba(255, 255, 255, 0.08);
+    z-index: 1;
+}
+
+.identity-selector:hover .header-tooltip,
+.profile-selector:hover .header-tooltip {
+    opacity: 1;
+}
+
+.identity-dropdown.show ~ .header-tooltip,
+.profile-dropdown.show ~ .header-tooltip {
+    opacity: 0 !important;
+}
+
+/* Identity Selector Styles */
+.identity-selector {
+    position: relative;
+    pointer-events: auto;
+    margin-left: 1rem;
+    z-index: 9999 !important;
+}
+
+.identity-btn {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    padding: 0.5rem 1rem;
+    background: rgba(0, 0, 0, 0.4);
+    backdrop-filter: blur(20px);
+    border: 1px solid rgba(255, 255, 255, 0.1);
+    border-radius: 12px;
+    color: white;
+    cursor: pointer;
+    font-family: 'Space Grotesk', sans-serif;
+    font-weight: 600;
+    transition: all 0.2s ease;
+    z-index: 100000 !important;
+    pointer-events: auto !important;
+}
+
+.identity-btn:hover {
+    background: rgba(255, 255, 255, 0.1);
+    border-color: rgba(34, 197, 94, 0.4);
+}
+
+.identity-btn i {
+    color: #22c55e;
+}
+
+.identity-dropdown {
+    position: absolute;
+    top: 100%;
+    left: 0;
+    margin-top: 0.5rem;
+    width: 200px;
+    background: rgba(20, 20, 20, 0.95);
+    backdrop-filter: blur(20px);
+    border: 1px solid rgba(255, 255, 255, 0.1);
+    border-radius: 12px;
+    padding: 0.5rem;
+    display: none;
+    flex-direction: column;
+    z-index: 2000;
+    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
+    animation: fadeIn 0.1s ease;
+}
+
+.identity-dropdown.show {
+    display: flex;
+}
+
+.identity-list {
+    max-height: 200px;
+    overflow-y: auto;
+}
+
+.identity-item {
+    padding: 0.6rem 0.8rem;
+    border-radius: 8px;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    color: #ccc;
+    transition: all 0.2s;
+}
+
+.identity-item:hover {
+    background: rgba(255, 255, 255, 0.1);
+    color: white;
+}
+
+.identity-item.active {
+    background: rgba(34, 197, 94, 0.2);
+    color: white;
+    font-weight: bold;
+}
+
+.identity-item.active::before {
+    content: '\2022';
+    color: #22c55e;
+    font-size: 1.2rem;
+}
+
+.identity-divider {
+    height: 1px;
+    background: rgba(255, 255, 255, 0.1);
+    margin: 0.5rem 0;
+}
+
+.identity-action {
+    padding: 0.6rem 0.8rem;
+    border-radius: 8px;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    color: #22c55e;
+    font-weight: 600;
+}
+
+.identity-action:hover {
+    background: rgba(34, 197, 94, 0.1);
+}
+
+.identity-empty {
+    padding: 0.6rem 0.8rem;
+    color: #666;
+    font-size: 0.85rem;
+    text-align: center;
+}
+
 /* Profile Selector Styles */
 .profile-selector {
     position: relative;

backend/core/config.js

@@ -708,6 +708,15 @@ function loadLauncherHardwareAcceleration() {
   return config.launcherHardwareAcceleration !== undefined ? config.launcherHardwareAcceleration : true;
 }
 
+function saveAllowMultiInstance(enabled) {
+  saveConfig({ allowMultiInstance: !!enabled });
+}
+
+function loadAllowMultiInstance() {
+  const config = loadConfig();
+  return config.allowMultiInstance !== undefined ? config.allowMultiInstance : false;
+}
+
 // =============================================================================
 // MODS MANAGEMENT
 // =============================================================================
@@ -1105,6 +1114,8 @@ module.exports = {
   loadCloseLauncherOnStart,
   saveLauncherHardwareAcceleration,
   loadLauncherHardwareAcceleration,
+  saveAllowMultiInstance,
+  loadAllowMultiInstance,
 
   // Mods
   saveModsToConfig,

backend/launcher.js

@@ -20,6 +20,8 @@ const {
 
   saveLauncherHardwareAcceleration,
   loadLauncherHardwareAcceleration,
+  saveAllowMultiInstance,
+  loadAllowMultiInstance,
 
   loadConfig,
   saveConfig,
@@ -151,6 +153,10 @@ module.exports = {
   saveLauncherHardwareAcceleration,
   loadLauncherHardwareAcceleration,
 
+  // Multi-instance functions
+  saveAllowMultiInstance,
+  loadAllowMultiInstance,
+
   // Config functions
   loadConfig,
   saveConfig,

backend/managers/gameLauncher.js

@@ -30,6 +30,7 @@ const { syncModsForCurrentProfile } = require('./modManager');
 const { getUserDataPath } = require('../utils/userDataMigration');
 const { syncServerList } = require('../utils/serverListSync');
 const { killGameProcesses } = require('./gameManager');
+const { loadAllowMultiInstance } = require('../core/config');
 
 // Client patcher for custom auth server (sanasol.ws)
 let clientPatcher = null;
@@ -464,8 +465,10 @@ async function launchGame(playerNameOverride = null, progressCallback, javaPathO
   }
 
   // Kill any stalled game processes from a previous launch to prevent file locks
-  // and "game already running" issues
+  // and "game already running" issues (skip if multi-instance mode is enabled)
-  await killGameProcesses();
+  if (!loadAllowMultiInstance()) {
+    await killGameProcesses();
+  }
 
   // Remove AOT cache: generated by official Hytale JRE, incompatible with F2P JRE.
   // Client adds -XX:AOTCache when this file exists, causing classloading failures.
@@ -479,15 +482,11 @@ async function launchGame(playerNameOverride = null, progressCallback, javaPathO
     }
   }
 
-  // DualAuth Agent: Set JAVA_TOOL_OPTIONS so java picks up -javaagent: flag
+  // DualAuth Agent: DISABLED for debug - testing fastutil classloader issue
-  // This enables runtime auth patching without modifying the server JAR
+  // TODO: re-enable after testing
   const agentJar = path.join(gameLatest, 'Server', 'dualauth-agent.jar');
   if (fs.existsSync(agentJar)) {
-    const agentFlag = `-javaagent:"${agentJar}"`;
+    console.log('DualAuth Agent: SKIPPED (debug build - fastutil classloader test)');
-    env.JAVA_TOOL_OPTIONS = env.JAVA_TOOL_OPTIONS
-      ? `${env.JAVA_TOOL_OPTIONS} ${agentFlag}`
-      : agentFlag;
-    console.log('DualAuth Agent: enabled via JAVA_TOOL_OPTIONS');
   }
 
   try {

backend/managers/javaManager.js

@@ -106,6 +106,23 @@ function getBundledJavaPath(jreDir = JRE_DIR) {
     }
   }
 
+  // Fallback: check for nested JRE directory (e.g. jdk-25.0.2+10-jre/bin/java)
+  // This happens when flattenJREDir fails due to EPERM/EACCES on Windows
+  try {
+    if (fs.existsSync(jreDir)) {
+      const entries = fs.readdirSync(jreDir, { withFileTypes: true });
+      for (const entry of entries) {
+        if (entry.isDirectory() && entry.name !== 'bin' && entry.name !== 'lib') {
+          const nestedCandidate = path.join(jreDir, entry.name, 'bin', JAVA_EXECUTABLE);
+          if (fs.existsSync(nestedCandidate)) {
+            console.log(`[JRE] Using nested Java path: ${nestedCandidate}`);
+            return nestedCandidate;
+          }
+        }
+      }
+    }
+  } catch (_) { /* ignore */ }
+
   return null;
 }
 
@@ -409,7 +426,7 @@ function extractTarGz(tarGzPath, dest) {
 function flattenJREDir(jreLatest) {
   try {
     const entries = fs.readdirSync(jreLatest, { withFileTypes: true });
-    
+
     if (entries.length !== 1 || !entries[0].isDirectory()) {
       return;
     }
@@ -420,12 +437,48 @@ function flattenJREDir(jreLatest) {
     for (const file of files) {
       const oldPath = path.join(nested, file.name);
       const newPath = path.join(jreLatest, file.name);
-      fs.renameSync(oldPath, newPath);
+      try {
+        fs.renameSync(oldPath, newPath);
+      } catch (renameErr) {
+        if (renameErr.code === 'EPERM' || renameErr.code === 'EACCES' || renameErr.code === 'EBUSY') {
+          console.log(`[JRE] Rename failed for ${file.name} (${renameErr.code}), using copy fallback`);
+          copyRecursiveSync(oldPath, newPath);
+        } else {
+          throw renameErr;
+        }
+      }
     }
 
-    fs.rmSync(nested, { recursive: true, force: true });
+    try {
+      fs.rmSync(nested, { recursive: true, force: true });
+    } catch (rmErr) {
+      console.log('[JRE] Could not remove nested JRE dir (non-critical):', rmErr.message);
+    }
   } catch (err) {
-    console.log('Notice: could not restructure Java directory:', err.message);
+    console.error('[JRE] Failed to restructure Java directory:', err.message);
+    // Last resort: check if java exists in a nested subdir and skip flatten
+    try {
+      const entries = fs.readdirSync(jreLatest, { withFileTypes: true });
+      const nestedDir = entries.find(e => e.isDirectory() && e.name !== 'bin' && e.name !== 'lib');
+      if (nestedDir) {
+        const nestedBin = path.join(jreLatest, nestedDir.name, 'bin', process.platform === 'win32' ? 'java.exe' : 'java');
+        if (fs.existsSync(nestedBin)) {
+          console.log(`[JRE] Java found in nested dir: ${nestedDir.name}, leaving structure as-is`);
+        }
+      }
+    } catch (_) { /* ignore */ }
+  }
+}
+
+function copyRecursiveSync(src, dest) {
+  const stat = fs.statSync(src);
+  if (stat.isDirectory()) {
+    fs.mkdirSync(dest, { recursive: true });
+    for (const child of fs.readdirSync(src)) {
+      copyRecursiveSync(path.join(src, child), path.join(dest, child));
+    }
+  } else {
+    fs.copyFileSync(src, dest);
   }
 }
 

docs/FASTUTIL_CLASSLOADER_ISSUE.md

@@ -1,6 +1,6 @@
 # Singleplayer Server Crash: fastutil ClassNotFoundException
 
-## Status: Open (user-specific, Feb 24 2026)
+## Status: Open (multiple users, Feb 24-27 2026)
 
 ## Symptom
 
@@ -16,12 +16,14 @@ Caused by: java.lang.ClassNotFoundException: it.unimi.dsi.fastutil.objects.Objec
 
 Server exits with code 1. Multiplayer works fine for the same user.
 
-## Affected User
+## Affected Users
+
+1. **ヅ𝚃 JAYED !** (Feb 24) — Windows x86_64, had AOT cache errors before fastutil crash
+2. **Asentrix** (Feb 27) — Windows x86_64 (NT 10.0.26200.0), RTX 4060, Launcher v2.4.4, NO AOT cache errors
 
-- Discord: ヅ𝚃 JAYED !
-- Platform: Windows (standard x86_64, NOT ARM)
 - Reproduces 100% on singleplayer, every attempt
-- Other users (including macOS/Linux) are NOT affected
+- Multiplayer works fine for both users
+- macOS/Linux users are NOT affected
 
 ## What Works
 
@@ -43,42 +45,49 @@ Server exits with code 1. Multiplayer works fine for the same user.
 - **Corrupted game files**: Repair/reinstall didn't help
 - **ARM64/Parallels**: User is on standard Windows, not ARM
 
-### Likely Causes (user-specific)
+### Likely Cause
 
-1. **Antivirus interference** — Windows Defender or third-party AV blocking Java from reading classes out of JAR files, especially with `-javaagent` active
+**CDS (Class Data Sharing) broken by bootstrap classloader modification.** DualAuth agent calls `appendToBootstrapClassLoaderSearch()` which triggers JVM warning: `"Sharing is only supported for boot loader classes because bootstrap classpath has been appended"`. This disables AppCDS for application classes. On some Windows systems, this breaks the classloader's ability to find classes (including fastutil) from the fat JAR.
-2. **Corrupted/incompatible JRE** — bundled JRE might be broken on their system
-3. **File locking** — another process holding HytaleServer.jar open
 
-## Debugging Steps (ask user)
+This warning appears for ALL users, but only breaks classloading on some Windows systems — reason unknown.
 
-1. **Does official Hytale singleplayer work?** (without F2P launcher)
+### Other Possible Causes
-   - Yes → something about our launch setup
-   - No → their system/JRE issue
 
-2. **Check antivirus** — add game directory to Windows Defender exclusions:
+1. **Antivirus interference** — AV blocking Java from reading classes out of JAR files
-   - Settings → Windows Security → Virus & threat protection → Exclusions
+2. **File locking** — another process holding HytaleServer.jar open (Asentrix had stalled java.exe killed at launch)
-   - Add their HytaleF2P install folder
 
-3. **Verify fastutil is in the JAR**:
+## Potential Fix: `-Xshare:off` (testing Feb 27)
-   ```cmd
-   jar tf "D:\path\to\Server\HytaleServer.jar" | findstr fastutil
-   ```
-   - If output shows fastutil classes → JAR is fine, classloader issue
-   - If no output → JAR is incomplete/corrupt (different from other users)
 
-4. **Try without DualAuth agent** — rename `dualauth-agent.jar` in Server/ folder, retry singleplayer
+Disables CDS entirely, forcing standard classloading. User can add via launcher:
-   - If works → agent's classloader manipulation breaks fastutil on their setup
+1. **Settings** → **Java Wrapper Configuration** → **Arguments to Inject**
-   - If still fails → unrelated to agent
+2. Add `-Xshare:off` with **Server Only** condition
+3. Retry singleplayer
 
-5. **Check JRE version** — have them run:
+Sent to affected users for testing — **awaiting results**.
-   ```cmd
-   "D:\path\to\jre\latest\bin\java.exe" -version
-   ```
 
-## Update (Feb 24): `-XX:+UseCompactObjectHeaders` stripping removed from defaults
+If confirmed, should be added as default inject arg (server-only) in launcher config.
 
+## Debugging Steps (for reference)
+
+Most steps are impractical for F2P users:
+- ~~Official Hytale singleplayer~~ — F2P users don't have official access
+- ~~Try without DualAuth agent~~ — not possible, agent required for F2P token validation
+- ~~Verify fastutil in JAR~~ — same JAR for all users, not a user-actionable step
+- ~~Check JRE version~~ — bundled with launcher, same for all users
+
+**Practical steps:**
+1. **Add `-Xshare:off`** via wrapper inject args (server-only) — testing now
+2. **Check antivirus** — add game directory to Windows Defender exclusions
+3. **Check for stalled processes** — kill any leftover java.exe/HytaleServer before launch
+
+## Update History
+
+### Feb 24: `-XX:+UseCompactObjectHeaders` stripping removed from defaults
 Stripping this flag did NOT fix the issue. The server already has `-XX:+IgnoreUnrecognizedVMOptions` so unrecognized flags are harmless. The flag was removed from default `stripFlags` in `backend/core/config.js`.
 
+### Feb 27: Second user (Asentrix) reported, `-Xshare:off` sent for testing
+Asentrix hit the same crash on Launcher v2.4.4. Unlike JAYED, no AOT cache errors — just the CDS sharing warning followed by fastutil ClassNotFoundException. This confirms the issue is not AOT-specific but related to CDS/classloader interaction with the DualAuth agent's bootstrap CL modification. Sent `-Xshare:off` workaround to affected users — awaiting results.
+
 ## Using the Java Wrapper to Strip JVM Flags
 
 If a user needs to strip a specific JVM flag (e.g., for debugging or compatibility), they can do it via the launcher UI:
@@ -110,4 +119,5 @@ Config is stored in `config.json` under `javaWrapperConfig`:
 
 - Java wrapper config: `backend/core/config.js` (stripFlags / injectArgs)
 - DualAuth Agent: v1.1.12, package `ws.sanasol.dualauth`
-- Game version at time of report: `2026.02.19-1a311a592`
+- Game version at time of reports: `2026.02.19-1a311a592`
+- Log submission ID (Asentrix): `c88e7b71`

main.js

@@ -3,7 +3,7 @@ require('dotenv').config({ path: path.join(__dirname, '.env') });
 const { app, BrowserWindow, ipcMain, dialog, shell } = require('electron');
 const { autoUpdater } = require('electron-updater');
 const fs = require('fs');
-const { launchGame, launchGameWithVersionCheck, installGame, saveUsername, loadUsername, saveJavaPath, loadJavaPath, saveInstallPath, loadInstallPath, saveDiscordRPC, loadDiscordRPC, saveLanguage, loadLanguage, saveCloseLauncherOnStart, loadCloseLauncherOnStart, saveLauncherHardwareAcceleration, loadLauncherHardwareAcceleration, isGameInstalled, uninstallGame, repairGame, getHytaleNews, handleFirstLaunchCheck, proposeGameUpdate, markAsLaunched, loadConfig, saveConfig, checkLaunchReady } = require('./backend/launcher');
+const { launchGame, launchGameWithVersionCheck, installGame, saveUsername, loadUsername, saveJavaPath, loadJavaPath, saveInstallPath, loadInstallPath, saveDiscordRPC, loadDiscordRPC, saveLanguage, loadLanguage, saveCloseLauncherOnStart, loadCloseLauncherOnStart, saveLauncherHardwareAcceleration, loadLauncherHardwareAcceleration, saveAllowMultiInstance, loadAllowMultiInstance, isGameInstalled, uninstallGame, repairGame, getHytaleNews, handleFirstLaunchCheck, proposeGameUpdate, markAsLaunched, loadConfig, saveConfig, checkLaunchReady } = require('./backend/launcher');
 const { retryPWRDownload } = require('./backend/managers/gameManager');
 const { migrateUserDataToCentralized } = require('./backend/utils/userDataMigration');
 
@@ -23,8 +23,9 @@ const profileManager = require('./backend/managers/profileManager');
 
 logger.interceptConsole();
 
-// Single instance lock
+// Single instance lock (skip if multi-instance mode is enabled)
-const gotTheLock = app.requestSingleInstanceLock();
+const multiInstanceEnabled = loadAllowMultiInstance();
+const gotTheLock = multiInstanceEnabled || app.requestSingleInstanceLock();
 
 if (!gotTheLock) {
   console.log('Another instance is already running. Quitting...');
@@ -740,6 +741,15 @@ ipcMain.handle('load-close-launcher', () => {
   return loadCloseLauncherOnStart();
 });
 
+ipcMain.handle('save-allow-multi-instance', (event, enabled) => {
+  saveAllowMultiInstance(enabled);
+  return { success: true };
+});
+
+ipcMain.handle('load-allow-multi-instance', () => {
+  return loadAllowMultiInstance();
+});
+
 ipcMain.handle('save-launcher-hw-accel', (event, enabled) => {
   saveLauncherHardwareAcceleration(enabled);
   return { success: true };

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hytale-f2p-launcher",
-  "version": "2.4.3",
+  "version": "2.4.5",
   "description": "A modern, cross-platform launcher for Hytale with automatic updates and multi-client support",
   "homepage": "https://git.sanhost.net/sanasol/hytale-f2p",
   "main": "main.js",

preload.js

@@ -20,6 +20,8 @@ contextBridge.exposeInMainWorld('electronAPI', {
   loadLanguage: () => ipcRenderer.invoke('load-language'),
   saveCloseLauncher: (enabled) => ipcRenderer.invoke('save-close-launcher', enabled),
   loadCloseLauncher: () => ipcRenderer.invoke('load-close-launcher'),
+  saveAllowMultiInstance: (enabled) => ipcRenderer.invoke('save-allow-multi-instance', enabled),
+  loadAllowMultiInstance: () => ipcRenderer.invoke('load-allow-multi-instance'),
   loadConfig: () => ipcRenderer.invoke('load-config'),
   saveConfig: (configUpdate) => ipcRenderer.invoke('save-config', configUpdate),
 

server/commit-msg.txt

@@ -1,17 +0,0 @@
-## v2.4.0
-
-### New Features
-- **Send Logs** — One-click button to submit launcher & game logs to support. Collects launcher logs, game client logs, and config snapshot into a ZIP, uploads to server, and returns an 8-character ID to share with support ([320ca54](https://git.sanhost.net/sanasol/hytale-f2p/commit/320ca547585c67d0773dba262612db5026378f52), [19c8991](https://git.sanhost.net/sanasol/hytale-f2p/commit/19c8991a44641ebbf44eec73a0ecd9db05241c49))
-- **Arabic (ar-SA) locale** with full RTL support (community contribution by @Yugurten) ([30929ee](https://git.sanhost.net/sanasol/hytale-f2p/commit/30929ee0da5a9c64e65869d6157bd705db3b80f0))
-- **One-click dedicated server scripts** for self-hosting ([552ec42](https://git.sanhost.net/sanasol/hytale-f2p/commit/552ec42d6c7e1e7d1a2803d284019ccae963f41e))
-
-### Bug Fixes
-- Fix Intel Arc iGPU (Meteor Lake/Lunar Lake) on PCI bus 00 being misdetected as discrete GPU on dual-GPU Linux systems ([19c8991](https://git.sanhost.net/sanasol/hytale-f2p/commit/19c8991a44641ebbf44eec73a0ecd9db05241c49))
-- Fix stalled game processes blocking launcher operations — automatic process cleanup on repair and relaunch ([e14d56e](https://git.sanhost.net/sanasol/hytale-f2p/commit/e14d56ef4846423c1fd172d88334cb76193ee741))
-- Fix AOT cache crashes — stale cache cleared before game launch ([e14d56e](https://git.sanhost.net/sanasol/hytale-f2p/commit/e14d56ef4846423c1fd172d88334cb76193ee741))
-- Fix Arabic RTL CSS syntax ([fb90277](https://git.sanhost.net/sanasol/hytale-f2p/commit/fb90277be9cf5f0b8a90195a7d089273b6be082b))
-
-### Other
-- Updated README with Forgejo URLs and server setup video ([a649bf1](https://git.sanhost.net/sanasol/hytale-f2p/commit/a649bf1fcc7cbb2cd0d9aa0160b07828a144b9dd), [66faa1b](https://git.sanhost.net/sanasol/hytale-f2p/commit/66faa1bb1e39575fecb462310af338d13b1cb183))
-
-**Full changelog**: [v2.3.8...v2.4.0](https://git.sanhost.net/sanasol/hytale-f2p/compare/v2.3.8...v2.4.0)