i've got a creative labs tnt2 ultra running ut in d3d mode. in 32-bit rendering, the detail textures freak out. if i am in an area where you can see a lot of ground, like outside areas and large rooms, the detail textures flicker between being normal, invisible, or sort of cross-hatched. it isn't every texture though, different polygons act differently, so i'll be running around and there are flickering triangles of detail texture all around. this doesn't happen in 16-bit mode, but that just doesn't look as good.