Did you try redefining the triplebuffer to a double? If that doesn't fix it then could you post a pic so we could see exactly what these lines look like? I have experienced another "lines" problem since the latest update. After my system has been on for a while, and when running a 3dGS app, there are thick black or white lines all over the place, bad flicker, and other weirdness. If I play a non-3DGS game, after this, it affects it, as well. Perhaps this is what you've been describing? The triplebuffer/refresh shearing problem is an entirely different looking anomaly.