First a note to the Ed. You ask people to accurately describe their problem: I can see why now because I just tried checking with previous threads and so many just said 'Desktop', which is a bit general. When I play a game like Pinball on Full Screen on finishing I find my Desktop picture has reduced to only a quarter of the screen and the rest is the 'Colour'. This is easily remedied by right clicking and changing the 'Stretch' back to itself then Apply. But why is it happening? Graphics driver is up-to-date.