Confirmed with a Mobile Intel(R) 965 Express Chipset Family , driver viseron 8.15.10.1930 running Windows 7 Professional (x64) and Blender 2.57 RC0 (r35816) 64bit; the automatic setting causes the Move to Layer menu to flash and disappear. Both overlap and triple buffer works, though I don't know if the latter causes performance hits.Opening User Preferences as a second window still causes it to hang, but can be accessed via the described workaround. This happens regardless of the draw method.I've also had drawing errors when using GLUT (same computer and OS), though I don't know if the issues are related. D3D related projects seem to be doing better in that regard.Everything seems to work fine in Linux (Ubuntu 10.04, x64), though some modes (such as Full ) causes performance drops.