Problem with WoW game/program...

I wasn't sure where to put this, as teh gaming forum seems like they are just talking about games and there isn't a whole lot of activity, and tis is a software program so... anyways my problem.

Something new has cropped up while playing WoW. Now when I ride in on a Hippogryph or a Boat, the platform that I land on or the dock that the boat docks at isn't there. They're invisible except for the boxes and stuff that are on top of them. They do eventually load in, but it can take 30 seconds or 2 minutes. Anyone have any idea why this could be happening? I just updated to the 7777 drivers today, but while my BSOD on exit has dissapeared, I am now getting this, although this happened a couple times with the older 7772 drivers as well. Any clues?

I have talked to Blizzard tech support, but they are stumped as to what could be causing it.