always, always, always with AVI issues, find out what the FOURCC is and thus what codec the file uses. AVI is just a container, not a codec. You can use AVIC or abcAVI to do this as well as many editors. If we know the fourcc we can maybe help. First step would be to look up the fourcc on www.FOURCC.org - Video Codecs and Pixel Formats

Secondly, with an AVI, you can generally chop a bit out without re-encoding so you can post a sample on the net so we can replicate the issue. I found a really good freeware one the other night, but it is on my pc at home, I can let you know where to get it if you like.

Also, as a previous poster said, what generated the AVI file?