Hi, About BWindowScreen. Just ran two more apps: -my own testing app: this one reports That CanControlFrameBuffer says ' NO'. this is incorrect (should be yes, as far as the driver is concerned, and that function should check the driver for MOVE_DISPLAY existance I think (am not sure though, I have to look it up to be sure)) -pageflipper: Works partly. Acceleration hooks are exported. The ball is drawn, the MOVE_DISPLAY function is called, and gets correct coordinates. The other intermixed curved white lines picture is missing though. And a bit more info about quitting: After all: Setmode _is_ called. It's just not sending valid parameters! (screen size = 0,0, colorspace = 0x00000000). Naturally the driver refuses to set that with the effect that from the looks of things onscreen: the mode isn't restored, but left at the last used mode issued inside BWindowScreen. Bye! Rudolf.