Do you fall through this black spot? If not, then it has to do with the bumpmapping bug. I used to have an old ATI 9250, if i turned the bumpmapping above number 2, which is 3, which is also the highest, things would randomly turn black, like they were still there, but the card couldnt process the shaders. That might well be your problem. ANd your ingame graphics do affect what the textures look like in the UE as well. Hope it helps, ps, i added you to xfire.