Last modified: 2014-06-23 16:07:00 UTC
Tabs on Special:Preferences page and Gadgets have stopped working, unless I comment out require_once("$IP/extensions/Vector/Vector.php"); in LocalSettings.php. Opening any page with Chrome browser, the developer console shows "Uncaught Error: Unknown dependency: jquery.collapsibleTabs" in load.php:150 I tried a re-install but it still has the same problem.
The jquery.collapsibleTabs module has been moved back-and-forth between MediaWiki core and the Vector extension. Which versions of both you are using, exactly?
MediaWiki 1.21.1 and Vector version 0.3.0 as comes with it.
*** This bug has been marked as a duplicate of bug 49228 ***