Pillars Seen On AVI Output

Tomsde wrote on 8/19/2009, 10:26 AM
When I rendered a project to an AVI file, although the aspect ratio matched by video footage, I got small pillars on each side of the finished movie. The video was rendered at 640 x 480. How can I get rid of them?

I rendered the same footage as a .mov file and no pillars are seen; it just seems that Vimeo doesn't want to upload the file in the Sony Vegas format that I created for some reason. I have a premium account so size is no object.