I converted camcorder tapes to dvd on a standalone. I then edited and chapterized in MyDVD. They play fine but some won't disk copy for backup... I guess they copy process is supersensitive to tiny scratches. I try to use DVDShrink to do the backup even though they aren't encrypted and don't have to be shrunk... It is a good way to get an ISO file for burning with Imgbrn. BUT I get the message Invalid Navigation structure. Why would this be. Am I going to the trouble of backing this all up for the future and ending up having disks that aren't going to do well do to some strange navigation structure?