Last modified: 2009-04-03 05:54:15 UTC
The <link rel="stylesheet" ... /> tag in head includes [[MediaWiki:monobook.css]] on Wiktionaries (wikis where forced capitalization is disabled). The actual page is [[MediaWiki:Monobook.css]] (linked correctly for Wikipedias etc.), so on Wiktionaries [[MediaWiki:monobook.css]] and [[MediaWiki:Monobook.css]] are conflicting (consider [[MediaWiki:monobook.css]] being a redirect etc.)
It works due to the message cache, but this is a dupe anyway. *** This bug has been marked as a duplicate of bug 17700 ***