Perform a dbcheck as root on the problem vob's database. Be aware that this may take a considerable amount of time on large vobs. It will likely be required as the next step in any case.
NOTE: The redirect of the dbcheck.out file assumes you are running csh or sh. If you are running a different shell, adjust the command. Also, the string "vob_db" is not an abbreviation, and should be typed literally.
NOTE: If the dbcheck command has memory problems, leave off the "-p8192" option.
NOTE: The vob must be locked in step 2 to ensure the accuracy of the dbcheck output. If, however, an error occurs while locking the vob continue to step 3.