Thread:Project:Support desk/Not Quite an Error - No Special Pages

Hi there, looking for help with a decidedly weird issue with our private installation of MW. Just upgraded to 1.24.1 and now having a very annoying problem. Whenever we try to get to Special pages, they usually show up once but then navigating to another special page or back to one we just had open, we get "No such special page," and the link to valid ones becomes red, too. As I said, sometimes it does work (such as after an IISreset) but only for a few seconds/requests, which is how I got this info.

MediaWiki 1.24.1 on Windows Server 2008 R2 with IIS 7.5 PHP 5.6.5 (cgi-fcgi) MySQL 5.6.22-log

No debugging or trace has helped because it does not seem to register as an actual error, just a missing page.