Something is wrong with the resource loader. Tabs are broken in Special:Preferences when resource loader is in debug mode, but not when debug mode is off.
I haven't examined it yet, but it's one of three things:
- The code isn't being loaded in debug mode
- Something broken in debug mode is stopping the code from executing
- Something broke whatever event is being used in debug mode
Version: 1.18.x
Severity: normal
URL: http://translatewiki.net/wiki/Special:Preferences?debug=0