debug: add -Xshare:off to JAVA_TOOL_OPTIONS to test fastutil classloader fix

Disables JVM Class Data Sharing when DualAuth agent is active.
May fix singleplayer crash (NoClassDefFoundError: fastutil) on some Windows systems
where appendToBootstrapClassLoaderSearch breaks CDS classloading.

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

GUI/index.html

@@ -592,6 +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" />

GUI/js/settings.js

@@ -6,6 +6,7 @@ let browseJavaBtn;
 let settingsPlayerName;
 let discordRPCCheck;
 let closeLauncherCheck;
+let allowMultiInstanceCheck;
 let launcherHwAccelCheck;
 let gpuPreferenceRadios;
 let gameBranchRadios;
@@ -171,6 +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"]');
@@ -218,6 +220,10 @@ function setupSettingsElements() {
     closeLauncherCheck.addEventListener('change', saveCloseLauncher);
   }
 
+  if (allowMultiInstanceCheck) {
+    allowMultiInstanceCheck.addEventListener('change', saveAllowMultiInstance);
+  }
+
   if (launcherHwAccelCheck) {
     launcherHwAccelCheck.addEventListener('change', saveLauncherHwAccel);
   }
@@ -415,6 +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) {
@@ -587,6 +617,7 @@ async function loadAllSettings() {
   await loadCurrentUuid();
   await loadDiscordRPC();
   await loadCloseLauncher();
+  await loadAllowMultiInstance();
   await loadLauncherHwAccel();
   await loadGpuPreference();
   await loadVersionBranch();

GUI/locales/ar-SA.json

@@ -140,6 +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",

GUI/locales/de-DE.json

@@ -140,6 +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",

GUI/locales/en.json

@@ -140,6 +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",

GUI/locales/es-ES.json

@@ -140,6 +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",

GUI/locales/fr-FR.json

@@ -140,6 +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",

GUI/locales/id-ID.json

@@ -140,6 +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",

GUI/locales/pl-PL.json

@@ -140,6 +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",

GUI/locales/pt-BR.json

@@ -140,6 +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",

GUI/locales/ru-RU.json

@@ -140,6 +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",

GUI/locales/sv-SE.json

@@ -140,6 +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",

GUI/locales/tr-TR.json

@@ -140,6 +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",

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)
+  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.
@@ -485,8 +488,8 @@ async function launchGame(playerNameOverride = null, progressCallback, javaPathO
   if (fs.existsSync(agentJar)) {
     const agentFlag = `-javaagent:"${agentJar}"`;
     env.JAVA_TOOL_OPTIONS = env.JAVA_TOOL_OPTIONS
-      ? `${env.JAVA_TOOL_OPTIONS} ${agentFlag}`
-      : agentFlag;
+      ? `${env.JAVA_TOOL_OPTIONS} ${agentFlag} -Xshare:off`
+      : `${agentFlag} -Xshare:off`;
     console.log('DualAuth Agent: enabled via JAVA_TOOL_OPTIONS');
   }
 

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;
 }
 
@@ -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);
+      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;
+        }
+      }
     }
 
+    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
-2. **Corrupted/incompatible JRE** — bundled JRE might be broken on their system
-3. **File locking** — another process holding HytaleServer.jar open
+**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.
 
-## 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)
-   - Yes → something about our launch setup
-   - No → their system/JRE issue
+### Other Possible Causes
 
-2. **Check antivirus** — add game directory to Windows Defender exclusions:
-   - Settings → Windows Security → Virus & threat protection → Exclusions
-   - Add their HytaleF2P install folder
+1. **Antivirus interference** — AV blocking Java from reading classes out of JAR files
+2. **File locking** — another process holding HytaleServer.jar open (Asentrix had stalled java.exe killed at launch)
 
-3. **Verify fastutil is in the JAR**:
-   ```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)
+## Potential Fix: `-Xshare:off` (testing Feb 27)
 
-4. **Try without DualAuth agent** — rename `dualauth-agent.jar` in Server/ folder, retry singleplayer
-   - If works → agent's classloader manipulation breaks fastutil on their setup
-   - If still fails → unrelated to agent
+Disables CDS entirely, forcing standard classloading. User can add via launcher:
+1. **Settings** → **Java Wrapper Configuration** → **Arguments to Inject**
+2. Add `-Xshare:off` with **Server Only** condition
+3. Retry singleplayer
 
-5. **Check JRE version** — have them run:
-   ```cmd
-   "D:\path\to\jre\latest\bin\java.exe" -version
-   ```
+Sent to affected users for testing — **awaiting results**.
 
-## 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
-const gotTheLock = app.requestSingleInstanceLock();
+// Single instance lock (skip if multi-instance mode is enabled)
+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": "2.4.4",
+  "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))
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-### 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))
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-### 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))
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-**Full changelog**: [v2.3.8...v2.4.0](https://git.sanhost.net/sanasol/hytale-f2p/compare/v2.3.8...v2.4.0)