Anyone had problems with the Jurassic Park Disk in the Jurassic Park/Lost World box set? I can't play chapter 13 on the disk. If you try to play it, it jumps to chapter 14, or 12. If the disk is playing, it freezes at the end of chapter 12. Everything else is fine and the Lost World disk is fine. I've had the disk exchanged with the same results. And yes, I can play Gladiator etc. with no problems. Ideas anyone?