should not lock up.
this is happening to all games?
i had that too, but with just a few discs, i was able to re-rip the backup dvd on my pc with imgburn to .iso and add it normally to the drive again (pc ripping only workes with backuo discs, no originals without a special drive).
remove one game you have a backup disc as well. i bet that one works to be installed via any loader again (uhm meant try to rip a different backup with the loader)
hope that helps somehow