If I understood properly, there was a problem with the module that creates URLs from the thread title. It wasn't compatible with the latest version of vBulletin, and the development had halted, so that module was removed. As a result, everything that was pointing to local human-readable URLs is now broken.

The numerical thread IDs are still valid, though, so it should be possible to script a solution that turns

Code:
http://www.cartographersguild.com/general-discussion/10934-creative-commons-licensing-questions.html
into

Code:
http://www.cartographersguild.com/showthread.php?t=10934
I'm not sure if that's something that can, or should be, performed system-wide, but it could certainly be run on individual important items, like this thread and the index page.