It was a site with an animated hi-def movie, can't remember it now, but not youtube. some kind of demo for stage video where you can switch the hw accel on and off as you watch. with accel on, black screen behind the rest of the flash, accel off, movie is behind the flash objects.
also, i don't think the hw accel in FF4 (what I was using) works in XP, but that's a different issu
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