"Rudolf" <drivers.be-hold@xxxxxxxxxxxx> wrote: > CanControlFrameBuffer is actually OK. It checks against B_SCROLL in > the > end, which is correct. > The trouble is this: (inside that routine) > > (fAddonImage >= 0) && ... > > If I comment addonimage out the B_SCROLL flag is correctly > identified. I've removed that check now. Although I think it should also return false if cloning the accelerant failed - but probably not before having tried. BTW I might have fixed the extra processor usage for overlay bitmaps - turns out we invalidated the view (causing its Draw() message to be called and the background to be cleared again) for every overlay bitmap update. Can you check? Bye, Axel.