Sounds like a corrupt project file. Did you check for a project backup (autosave.veg.bak i think!)?? I've had a couple of terrible times like that with a band sitting right behind me goin "so do we gotta track it all again?"If this works it will restore you to an earlier time in the project .Then at least you won't have to start totally over. Just go to the following directory and click on all the autosaves with your fingers crossed !!Vegas auto saves to this directory: C:\Documents and Settings\Owner\Application Data\Sony\Vegas\5.0 (REPLACE OWNER WITH YOUR WINDOWS ACCOUNT NAME) It's a hidden folder. You can also find it by using your search files and folders dog. Just click options to allow hidden folder searches. Hope this helps. I feel your pain.