[BUG] Claude Desktop Windows (v1.1.4498) - Cowork mode blank history, unresponsive UI, React hydration errors

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?

Blank history panel — Cowork mode loads but the conversation history in the center of the screen shows nothing. Completely empty. No previous conversations are displayed.

Unresponsive UI — Clicking through the interface feels dead. Buttons, dialogs, and navigation elements either don't respond or respond with significant delay.

CSP blocking Anthropic's own API — The app's Content Security Policy is missing a-api.anthropic.com from its connect-src directive, so the app literally blocks its own outbound API calls.

React hydration crash loop — React error #418 fires repeatedly, meaning the UI render tree is corrupted. This is almost certainly why the history panel is blank.

VM service won't start — The plugin/Cowork VM service fails to initialize, breaking the Cowork infrastructure entirely.

Older builds work fine — A build from approximately March 5, 2026 does NOT have any of these issues. Cowork mode functions normally with full history and responsive UI. This is a regression in the latest official build.

What Should Happen?

History should load and display — Opening Cowork mode should show all previous conversation history in the center panel, exactly as it does in older builds.

UI should be fully responsive — All buttons, dialogs, navigation, and input fields should respond immediately to clicks and interaction without lag or dead zones.

CSP should allow Anthropic's own domains — a-api.anthropic.com needs to be added to the connect-src directive so the app can communicate with its own backend without self-blocking.

React rendering should be stable — The UI should hydrate cleanly without #418 errors. Server-rendered content and client-rendered content should match so the UI tree doesn't corrupt.

VM service should start successfully — The Cowork plugin VM should initialize on launch so that listAvailablePlugins and other Cowork features function properly.

New releases should not regress working features — Cowork worked perfectly in builds prior to ~March 5, 2026. A release should not ship with this level of breakage in a core feature.

Error Messages/Logs

All errors from %APPDATA%\Claude\logs\unknown-window.log:

React Hydration Failure (root cause of blank UI):

[2026-03-07 10:53:41] [error] Uncaught Error: Minified React error #418; 
visit https://react.dev/errors/418?args[]=text&args[]=

[2026-03-07 10:54:15] [error] Uncaught Error: Minified React error #418;
[2026-03-07 17:08:33] [error] Uncaught Error: Minified React error #418;
[2026-03-07 17:09:25] [error] Uncaught Error: Minified React error #418;
[2026-03-07 17:14:46] [error] Uncaught Error: Minified React error #418;

This error fires repeatedly across every session, corrupting the UI render tree.

CSP blocking Anthropic's own API domain:

[2026-03-07 17:09:04] [error] Connecting to 'https://a-api.anthropic.com/v1/m' violates the 
following Content Security Policy directive: "connect-src 'self' https://api.segment.io 
https://*.segment.io https://*.segment.com https://a-cdn.anthropic.com https://*.google.com 
https://*.facebook.com https://*.facebook.net https://*.doubleclick.net". 
The action has been blocked.

[2026-03-07 17:09:04] [error] Fetch API cannot load https://a-api.anthropic.com/v1/m. 
Refused to connect because it violates the document's Content Security Policy.

[2026-03-07 17:09:04] [error] Error sending segment performance metrics TypeError: Failed to fetch

Repeated at 10:46:47, 17:09:04, and 17:15:17.

VM Service failure killing Cowork/Plugins:

[2026-03-07 17:11:21] [error] [REACT_QUERY_CLIENT] QueryClient error: Error: Error invoking 
remote method '$eipc_message$_b9f22602-5f0e-4e9e-9b56-53e904f26e9d_$_claude.web_$_CustomPlugins
_$_listAvailablePlugins': Error: VM service not running. The service failed to start.

Broken Dialog components (fires on nearly every interaction):

[2026-03-07 17:08:39] [error] `DialogContent` requires a `DialogTitle` for the component 
to be accessible for screen reader users.

[2026-03-07 17:09:40] [error] `DialogContent` requires a `DialogTitle`...
[2026-03-07 17:10:54] [error] `DialogContent` requires a `DialogTitle`...
[2026-03-07 17:12:08] [error] `DialogContent` requires a `DialogTitle`...
[2026-03-07 17:12:11] [error] `DialogContent` requires a `DialogTitle`...
[2026-03-07 17:14:53] [error] `DialogContent` requires a `DialogTitle`...

Aria/Focus errors breaking UI interaction:

[2026-03-07 17:10:56] [warn] Blocked aria-hidden on an element because its descendant 
retained focus. The focus must not be hidden from assistive technology users.
Element with focus: <button.inline-flex items-center justify-center...>
Ancestor with aria-hidden: <div.root>

Steps to Reproduce

Steps to Reproduce
Download and install Claude Desktop from https://claude.ai/ (Windows, official installer)
Launch the app and log in
Attempt to use Cowork mode
Observe: history panel is blank, UI elements are unresponsive
Expected Behavior
Cowork mode should display conversation history and respond to user interaction, as it does in older builds.

Actual Behavior
Conversation history is blank (empty center panel)
UI is non-responsive / laggy
Multiple console errors logged continuously

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

claude-1-1-5368.exe

Claude Code Version

1.1.4498

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Workaround
Using an older Claude Desktop build (pre-March 5, 2026) resolves all issues.