My original AVP disc has only slight scratches but plays perfect in several DVD players, including my Oppo 970HD. After I backed it up I tried to edit the backup with DVD Shrink but received an error. "Invalid DVD navigation structure" Shrink won't load the movie. Playing the movie back directly via the VIDEO_TS IFO, WMP 10 says it's an "unknown DVD." Media Player Classic 6490 loads with the Play button depressed but the screen is blank and there is no sound. I'm a registered user using the latest 6130 version. AVP is the only movie I have that I can't edit after a backup.