There are posts about what I'm having on both the US and the EU blizzard forums, but nothing from the Blues so far. The thing is that they're only running single clients and getting this, while I have to bring up two D3D clients.

The flickering I see with two D3D is what's drawn on the other client, but in small flickering segments. Like in Arathi it could be far away hills or structures, in Orgrimmar and UC walls and houses and bits of interior detail.

Feels like another ATI specific thing, and my strongest Nvidia card is a 6600GT.