Hi, I have a Samsung HT-TQ72 Home Theater System and, although it plays almost all of my DVD-R discs, I have a few that it won't play. When I insert the disc I get the following message: PLAY PROHIBITED PLEASE CHECK DISC. I don't believe it has anything to do with the discs themselves because I have four DVD players and they all play fine on the others. One disc in particular is part of a two disc set, one plays fine but I get that message with the other. I've read through the entire instruction manual and can find nothing about this message whatsoever. Any ideas? Thanx.