Let me try and explain this one! I have 2 dvd writers, a Lite-on and Pioneer. They both read and write flawlessly. If I create a dvd backup using Fab Platinum on the pioneer and try to read the backup version on the pioneer, fab recognizes it as it should. If I take that same backup version and play on the lite-on fab will not recognize it. It either hangs or displays retry abort message. Now, the dvd will play normally on the lite-on drive!! I have tried this on 3 different dvd's. It will also play on my stand alone dvd players. What would cause fab not to recognize in on the lite-on drive? Now that is strange.