There seems to be an expert for everything here, so maybe someone can solve this one: When I open up video files they sometimes (maybe 40% of the time) appear as mainly solid colour blocks - usually reds or greens. I can just about see what's going on, but the action is represented by only one or two colours. The vid of the car catching light on a recent post is one I've been unable to view, amongst others. I've recently changed my pc (didn't have this problem before) and run Windows Media Player to open the files. Whad'ya reckon computer heads?