Does anyone else have this problem? I have groups of geometry, and when I try to rotate them in 3d, ortho or perspective, wireframe or opengl, it leaves half the group behind.!! I've already done the "best compatibility" in the nav graphic option...   But oddly, when you do plan view, ctrl-L to rotate, or rotate tool, it works an absolute treat!! see attached video   *Edit*! I think it's very worth while mentioning that it's imported sketch up geometry, but it'