I recently made copied of I, Robot and Spider-man 2 with CloneDVD 2. The copies came out perfect. I could play the DVD's on all 3 of my standalone DVD players. My son asked if I would make copies of them for him. Sure, I said. I fired up Nero to do a DVD copy. The software successfully copied both DVD's without error. After I copy a DVD I always play it to make sure it's ok before filing it away with my other backups. I usually just select a scene in the middle of the disk. When checking both copies they would not play. I even tried it on the DVD burner that I created it on. Then I used CloneDVD 2 to copy the original copies and they worked fine where the copies from Nero would not. Any ideas?