Hello, I too have had the same green bars on the keyboard with no effect on the sound, but visually annoying. I'm running dual CPU's and I have swapped video cards, sound cards, monitors, etc., and have concluded the MMV is incompatible with either a dual CPU setup up or my Tyan Tiger100 motherboard. I do video editing on this computer without a single problem. The demo gives me the same green bars. On a smaller computer at work, the MMV works fine except that the computer is only a 400MHz and is slow and unresponsive. If anyone has a solution, please let us know.