Try reflashing CS0T. Reflashing helped me once with the same problem you have, not recognising just one single dvd (it was seen as an audio-cd, with just one file on it. The file could not be opened, very weird). First I flashed my trusted BS0S, then I downloaded a new copy of CS0R or CS0T (don't remember wich one it was at that time) and flashed again. Until now it's still working fine. Maybe it works in your case too.