Claude Desktop v1.1.4173 crashes on startup: @formatjs/intl unhandled rejection

Description

Claude Desktop v1.1.4173 fails to display its window on startup. The process appears in Task Manager but no UI is rendered. Rolling back to v1.1.4010 resolves the issue.

Steps to Reproduce

1. Let Claude Desktop auto-update to v1.1.4173
2. Launch the app
3. Process starts (visible in Task Manager with 4 child processes) but no window appears

Error Output

Launching app-1.1.4173\claude.exe from PowerShell reveals two unhandled promise rejections:

This error originated either by throwing inside of an async function without a catch block,
or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:
Error: [@formatjs/intl] An `id` must be provided to format a message. You can either:
1. Configure your build toolchain with [babel-plugin-formatjs]
or [@formatjs/ts-transformer] OR
2. Configure your `eslint` config to include [eslint-plugin-formatjs]
to autofix this issue
    at nZe (...\app-1.1.4173\resources\app.asar\.vite\build\index.js:83:2748)
    at Sae (...\app-1.1.4173\resources\app.asar\.vite\build\index.js:83:4203)
    at WOt (...\app-1.1.4173\resources\app.asar\.vite\build\index.js:705:12468)
    at RDe (...\app-1.1.4173\resources\app.asar\.vite\build\index.js:705:14365)
    at Hd (...\app-1.1.4173\resources\app.asar\.vite\build\index.js:705:15535)
    at EventEmitter.<anonymous> (...\app-1.1.4173\resources\app.asar\.vite\build\index.js:1234:79020)

The error appears twice from two different call sites. These unhandled rejections crash the Electron renderer, preventing the window from appearing.

Additional Observations from main.log

• Claude Code process exited with code 1073807364 (0x40010004 = STATUS_LOCAL_DISCONNECT)
• [warn] Cannot save session: storage path not available (sessions lost across restarts)
• MCP servers fail with MCP error -32000: Connection closed (PDF Tools, Desktop Commander)
• desktop_mcp_unexpected_close events for AWS API MCP Server, Windows-MCP, Filesystem, Desktop Commander

Workaround

Launch v1.1.4010 directly, or rename the broken version folder:

Rename-Item "$env:LOCALAPPDATA\AnthropicClaude\app-1.1.4173" "$env:LOCALAPPDATA\AnthropicClaude\app-1.1.4173.broken"

Environment

• Working version: 1.1.4010
• Broken version: 1.1.4173
• OS: Windows 11 Home 10.0.26200
• CPU: Intel Core i7-9750H @ 2.60GHz
• RAM: 24 GB
• Arch: x64
• Node (from logs): v24.13.0