We dub most commercials to Beta Sp. We have a sony PVW-2800 beta deck. Recently, it has started giving us problems when we try to black the tape. It will say that its being blacked but it won't be. We're doing this from the FCP Edit to Tape. If you play with the controls, such as play, and Fast Forward, Re-Wind, it will eventually kick in. Sometimes it works on the first try, other times it can take several tries. Its very annoying. Any Suggestions?