[BUG] Claude Desktop blank screen on launch (M5 Pro Macbook) - IPC fails to provide accountUuid, falls back to bootstrap API

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?

Claude Desktop opens to a blank screen on launch. Issue persists after clearing Application Support, full uninstall, and clean reinstall. The last two lines of main.og show that the IPC channel not providing accountUuid, causing the app to fall back to the bootstrap API - which appears to fall silently, leaving the window blank instead of showing the login or chat UI

What Should Happen?

• Claude desktop should render the chat interface or login screen.
• If the IPC handoff fails, the app should recover without a hitch either by retrying, re-authenticating or showing an error instead of a blank window with no fall back

ProductName: macOS
ProductVersion: 26.5.2
BuildVersion: 25F84

Error Messages/Logs

Steps to Reproduce

1. Launch Claude on 16" MBP M5 Pro
2. App window opens but shows blank screen
3. Confirmed not a caching issue; I manually deleted the ~/Library/Application Support/Claude, fully uninstalled the app and did a clean install
4. Checked ~/Library/Logs/Claude/main.log; last two lines show that IPC is not providing accountUuid, falling back to bootstrap API

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.183 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_