Hi @user1u,

That 404 error on colors.css is a common issue, and the good news is it's usually fixable with a few straightforward steps. Since you're using LiteSpeed Cache, that's actually a likely culprit here. Let me walk you through the troubleshooting process:

Step-by-step solution:

1. Clear all caches first — Go to your LiteSpeed Cache plugin settings and perform a complete cache purge. This is critical because cached versions of your pages might be pointing to the wrong stylesheet path. After clearing, also clear your browser cache by doing a hard refresh (Ctrl+Shift+R on Windows or Cmd+Shift+R on Mac).
2. Verify the colors.css file location — Connect via FTP/Filezilla and navigate to your wpForo plugin directory. The colors.css file should be located in the styles folder. Based on the related forum content, check that you're using the correct style theme. Go to wpForo > Colors & Styles and ensure you have a valid style selected (the Dark style is mentioned as working well in similar cases).
3. Remove any custom CSS — Temporarily disable or remove all custom CSS you've added. Custom CSS can sometimes interfere with stylesheet loading, especially when cache plugins are involved.
4. Test in a private/incognito session — Open your forum in an incognito or private browser window. This bypasses your browser cache entirely and helps you see if the issue is cache-related or a genuine server problem.
5. Check file permissions — In Filezilla, right-click on the colors.css file and verify it has proper read permissions (644 is standard for files).

Can you let me know if the colors.css file is actually present in your wpForo styles directory? Also, which style theme are you currently trying to use? This will help me provide more targeted guidance if these steps don't resolve it.