Have you made movie files in any other program? Have you played movies made by other people on your compuiter? Jerky movie playback can occur if your machine is sharing IRQ's. If you have anything that insn't plug-n-play in your machine. It might be on the same IRQ as something else. Depending on what OS you run. You can find the IRQ listing for your hardware in the ControlPanel-> System->Device Manager window. Each component should have it's own IRQ. Might want to check that out. ScottA