Sometimes when my camera view has a close by obstruction, such as a tree branch, the display degenerates into an extremely pixelated, psychedelic image similar to a kaliedascope (spelling?). Anyways, my graphics are set to medium and I've had no problems with them before the last patch. The game is on an HDD, but as I said no problems until now. The effect is rare, intermittent, and I can't figure anything that might be causing it, other than tree branches or shrubbery that are not being displayed due to the position of my camera zoom.