## Description After using the Cowork feature and switching back to a regular chat tab, Claude Desktop's UI renders as if CSS is completely missing — it looks like raw, unstyled HTML. ## Steps to Reproduce 1. Open Claude Desktop on Windows (v1.1.3189) 2. Use the Cowork feature 3. Switch back to a regular chat tab 4. UI renders without any styling (like HTML without CSS) ## Workaround Fully quit Claude Desktop and delete the following folders under `%APPDATA%\Claude`: - `Cache` - `Code Cache` -

[BUG] Claude Desktop UI renders as unstyled HTML after switching from Cowork tab to regular chat

Status Fixed / completed

Maintainer reply None cached

Workaround ✓ Mentioned in description ↑

Activity 5 comments · opened Feb 18, 2026 · closed Feb 22, 2026

Description

After using the Cowork feature and switching back to a regular chat tab, Claude Desktop's UI renders as if CSS is completely missing — it looks like raw, unstyled HTML.

Steps to Reproduce

Open Claude Desktop on Windows (v1.1.3189)
Use the Cowork feature
Switch back to a regular chat tab
UI renders without any styling (like HTML without CSS)

Workaround

Fully quit Claude Desktop and delete the following folders under %APPDATA%\Claude:

Cache
Code Cache
GPUCache

Relaunch the app — styling is restored.

Environment

OS: Windows 11
Claude Desktop version: 1.1.3189

View original on GitHub ↗

5 Comments

brimalm · 7 months ago

I have this same issue. Clearing those folders did not solve my issue. In fact, reinstalling the whole app did not solve my issue.

karliky · 7 months ago

same here, I've just installed and has no CSS

brimalm · 7 months ago

Since I have this issue on all my computers, I'm thinking it might be a regional thing? I'm located in Sweden.

MarshallOfSound · 7 months ago

Hey folks, this was (a classic) DNS issue earlier in the week that seemed to impact specific regions. Should be all fixed now so closing this one out 🙇

github-actions[bot] · 7 months ago

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.