I had this kind of problem once.
The movie wasn't encoded with "regular" sizes (i.e. height and width weren't multiple of 16)
Whether the problem appeared or not also depended on using overlay or not.
It can be too that divxg400 is messing with your display. If you have it, try and disable it. (may be another display filter, but I know for sure that divxg400 can do this sort of thing)
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