I have tried DVD XCopy XPress and Platinum to make backup copies of several of my DVDs and they complete with no errors but will not play in my DVD ROM in the computer or my standalone APEX AD-600A DVD player. Both the DVD ROM and APEX player dont see a disc. My DVD burner is a Sony DRU500A and I have the latest firmware. If I put the burned DVD in my SONY DRU500A it sees that it is a DVD but will not play in WinDVD but it will play in Windows Media Player 9 from the DRU500A. Any ideas??? Thanks!