Start Avid and let it rebuild all the databases and try MediaMover again. If that fails to help, download MDV (a free MediaMover type program) and see if it can tell you more about the media. Here's the link for MDV:
http://fiool.nm.ru/progz/
I've used it to back up all my projects since it was released a few yearas ago.
Michael
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I'll be working late.