No one can post a new thread after upgrade :[

[jamesyfx]

Hmm, it shouldn't cause an error like this. If usergroup permissions were wrong, vBulletin itself would give an error.. This kind of message points to an error in the actual code.

I would first try creating a brand new style with no parent style, and try using that and see what happens.

If this doesn't work, try to re-upload all of your vBulletin files except install.php and config.php - you won't need to re-install or re-upgrade, since this has already been done.

... If none of that works, I'm at a loss. Either somebody else can chip in or you'll be waiting for vBulletin.com staff to get back to you.