did not see this addressed anywhere else. When I upgraded from GE3 Plus to the latest beta release (4.0.1657), many of the buildings on Manhattan Island are now flickering when I move the camera past them. It looks like they were built with multiple faces that have different coloring and the different shades of gray are fighting each other for visibility.
I have a high-end multimedia machine (3GB RAM) and I've tried clearing my 1500MB cache to no avail. I've also experimented with switching from OpenGL to Direct X and found no difference. It appears to be a problem with the building models themselves.
I am running the latest NVIDIA driver available for my card and the problem isn't on all buildings. Having seen this issue in 3D models I've built for video animation, I'm fairly confident that the problem lies in the actual models of the buildings. Perhaps they have identical polygons in the same place but two different shades of gray?
The attached placemark offers a good view of the problem... just navigate around it slowly and you should see what I'm talking about.