Quoting Neil Radisch ([EMAIL PROTECTED]):
> The box should slide across the screen smoothly without
> any video tearing artifacts. Unfortunately, despite the Flip() call
> using the WAITFORSYNC option, it still tears something awful.

Did you start the program without root privileges?
In this case you should use the matrox vsync irq patch.
Without root privileges the VGA registers cannot be polled.

-- 
Best regards,
  Denis Oliver Kropp

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