I don't really know how else to describe it. I have lines and walls that will shoot off into the great unknown with no end in sight. I have had this problem with roofs before because of a misplaced node, but never with slabs and walls until now. This seems to be all cleared up on the other machine though. I guess it is possible that I have another bad video card. I have run the hardware test on it and it passed, but so did the last one...
Dwight, have you noticed a shorter life on video cards due to high numbers or renderings or 3D work? This card is less than six months old! I will be running this to the Apple store for a replacement I guess.