well, I just went back and re-tested w/IE6... works fine for me. Very strange...
My version of IE is absolutely stock... hardly ever use it so no addons of any kind. My firefox is heavy with add-ins, however. hmmm... maybe it has something to do with the mouse driver... but I can't play w/that right now as I have some other jobs running that preclude me from trying too many other things right now. (I'm running the logitech driver 9.79 with the smart move disabled, btw.)
If you go to badger and blade (they also run the vBulletin forum) and pick a thread with more than 1 page (maybe in the barbershop forum... maybe the reinstate the draft thread... it has multiple pages) does it work the same or differently than you see here? It works the same as here for me.