ChatGPT Windows app hangs on launch on Windows build 26200; background processes start but no window is created

Environment

• Windows edition: Windows 10 Home China
• Windows version: 2009
• OS build: 26200
• Architecture: 64-bit
• ChatGPT package: OpenAI.Codex
• ChatGPT app version: 26.908.4834.0
• Package status: Ok
• Package entry point: app/ChatGPT.exe (Windows.FullTrustApplication)

Problem

The ChatGPT Windows app launches background processes successfully, but no visible application window is created.

Observed behavior

• Multiple ChatGPT.exe processes are created.
• All processes report Responding = True.
• MainWindowHandle = 0 for all ChatGPT processes.
• MainWindowTitle is empty.
• No visible ChatGPT window appears.

Example process state:

ProcessName: ChatGPT
MainWindowHandle: 0
Responding: True

Windows Error Reporting

FriendlyEventName=Stopped responding and was closed
AppName=Codex
AppPath=...\WindowsApps\OpenAI.Codex_26.908.4834.0_x64__2p2nqsd0c76g0\app\ChatGPT.exe
ReportDescription=A problem caused this program to stop interacting with Windows.

Troubleshooting already performed

• Uninstalled and reinstalled ChatGPT from Microsoft Store.
• Reset the AppX package.
• Verified package status = Ok.
• Removed the legacy OpenAI.ChatGPT-Desktop / ChatGPT Classic package.
• Confirmed only OpenAI.Codex remains installed.
• Verified Microsoft Edge WebView2 Runtime is installed and running.
• Verified multiple Microsoft Windows App Runtime versions are installed and report Status = Ok.
• Tested launching through shell:AppsFolder\OpenAI.Codex_2p2nqsd0c76g0!App.
• Tested direct ChatGPT.exe launch.
• Tested launch with --disable-gpu.
• Issue persists after all above steps.

Expected behavior

ChatGPT should open a visible main application window.

Actual behavior

ChatGPT background processes start, but no main window is ever created. Windows later records the application as not responding.

Additional notes

• The legacy ChatGPT Classic package previously also showed an Application Hang, but it has now been completely removed.
• The issue still reproduces with only OpenAI.Codex installed.
• Web version of ChatGPT works normally.

Start by reproducing the launch through shell:AppsFolder\OpenAI.Codex_2p2nqsd0c76g0!App and directly via app/ChatGPT.exe, using the listed Windows build and package version. Compare the process state and Windows Error Reporting output; done means the app creates a visible main window without later being recorded as not responding.