Ghosting can be caused by a lot of things. First set the preview to Best Full and see if it goes away. If it does, it’s just a preview thing and won’t be in the final render. It it doesn’t then you need to figure out what’s causing it. It could be caused by a mismatch in frame-rate between your project and the footage. Check that they match. It could have been caused in your MOV to AVI conversion. Vegas can edit DV MOV files so was the conversion really needed? Check the clip in Windows Media Player to see if it’s in the AVI file itself. It could also be motion blur in the original footage. Check the MOV file in Quicktime to see if it’s there.
If you can post an image of what you see it might help identify what is causing it. Not too long ago someone complained of ghosting and it was actually interlacing on fast moving objects that cause the fields to become very far apart in the 1/60 of a second that they were recorded. It’s always best if we can see what you are seeing.
~jr
http://www.johnrofrano.com
http://www.vasst.com