[BUG] Claude Desktop window invisible on Snapdragon X Plus + Windows 11 25H2

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

After Windows 11 25H2 update (KB5077241), Claude Desktop launches and runs in the background (4 processes visible in Task Manager) but no window is displayed. The app was working normally before the update.

Environment:

• OS: Windows 11 25H2 (Build 26200.7922)
• CPU: Snapdragon X Plus - X1P42100 (ARM64)
• GPU: Qualcomm Adreno X1-45 (driver: 31.0.96.0)
• RAM: 16 GB
• Claude Desktop: 1.1.4173, Electron 40.4.1

What was tried (all failed):

• Uninstalled KB5077241 and restarted
• Complete uninstall and reinstall
• Cleared all cache and app data
• sfc /scannow (found and repaired corrupted files)
• DISM /Online /Cleanup-Image /RestoreHealth
• --disable-gpu, --disable-gpu-compositing, --use-gl=swiftshader
• --window-position=100,100 --window-size=1200,800
• Windows 10 compatibility mode
• All 4 processes show MainWindowHandle: 0

Main log shows no errors - app starts normally but window never appears:
App reports arch: 'x64' despite running on ARM64 hardware.
API calls succeed (bootstrap returns 200).
No crash dumps found.

What Should Happen?

Claude Desktop window should appear normally after launch, as it did before the Windows 11 update.

Error Messages/Logs

Main log (C:\Users\hikar\AppData\Roaming\Claude\logs\main.log):

2026-02-25 22:22:41 [info] Starting app { appVersion: '1.1.4173', platform: 'win32', arch: 'x64', nodeVersion: '24.13.0' }
2026-02-25 22:22:42 [error] Sentry caught: { type: 'Error', value: '[@formatjs/intl] An id must be provided to format a message.' }
2026-02-25 22:22:42 [info] [CCD] Initialized with version 2.1.51
2026-02-25 22:22:43 [info] [EventLogging] desktop_windows_elevation_detected | elevation_type: 'limited', cpu_model: 'Snapdragon(R) X Plus - X1P42100', arch: 'x64'
2026-02-25 22:22:48 [info] [EventLogging] Flushing 2 events

Earlier launch also showed:
[ERROR:net\disk_cache\cache_util_win.cc:25] Unable to move the cache: Access denied (0x5)
[ERROR:net\disk_cache\disk_cache.cc:236] Unable to create cache

Note: App reports arch 'x64' on ARM64 hardware. All 4 processes show MainWindowHandle: 0. API calls succeed (bootstrap 200). No crash dumps found.

Steps to Reproduce

1. Have a Snapdragon X Plus ARM64 laptop running Windows 11 25H2 (Build 26200)
2. Install Windows update KB5077241 (2026-02-25)
3. Launch Claude Desktop
4. App runs in background (4 processes in Task Manager) but no window appears
5. Issue persists even after uninstalling KB5077241

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Unknown - same version 1.1.4173 worked before Windows update

Claude Code Version

1.1.4173

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_