I'm not sure if anybody else is experiencing the same problem, but is there an issue with alt-tabbing? Whenever I alt-tab out of a fullscreen game, the graphics are corrupted on returning.

Also, D3D is horribly sluggish - not sure if anything can be done about that.

I have the problem with alt-tab, but I haven't experienced any sluggishness.

Same problem with Alt-tab, but never had any of the sluggishness you describe

I get both the issues you describe :( Haven't been able to play at all.