Hi guys,
I have the same problem, but I suspect it's just some information from UBB that hasn't yet been fully ported over to the VBulletin software. This stuff is actually a much, much bigger PITA for the admins and mods than most users would suppose. Just updating to new versions of VBulletin at my old site was enough to make us want to drink a fifth of bourbon and shoot ourselves; completely switching over from UBB to VB, as Frank et al have done, is considerably nastier. Let's give them some time.
Yours,
David