The OpenGL implementation in Vue d'Esprit 4 uses a less sophisticated feature set of OpenGL than Vue Pro. What it "touches" in OpenGL is different from Vue Pro, because the code base is significantly different. When an application uses OpenGL, its supposed to be able to say "hey OpenGL, gimme this and this and this", and the response should be the same on any platform, Windows or Mac, and with any video card/drivers. So there are three parts at work here: the application, video card/drivers, operating system implementation of OpenGL. If everything has been implemented according to "spec" by all three, then there isnt any reason why it shouldnt work. But it often doesnt happen that way because developers cut corners, or cause something to write into a memory space where it shouldnt, or create some kind of conflict that messes up the others and not document it so we can try to find a workaround of some kind. I dont experience the same problems you are experiencing, but then again, Im certain we have different configurations of just about everything. My wish for mid-range graphics card designers is that they would spend as much time on OpenGL conformance as they do with DirectX. Best regards, Lynn Fredricks e-on software