We've had variour reports that menu and configs aren't loading.
Most seem to correct themselves after a full 'reinstall' after removal of gmod/data/UL<*> (only in svn)
"Release" version is probably beyond repair.
Are you running SVN or release?
And, common questions... dedicated or listen? What errors, etc?
(note, I'm headed to bed soon, 16+ hours before my next response. Someone else may help)