Over the years I have had some trouble with backing up DVDs correctly: either the time codes were missing after ripping, or subtitles that would work correctly on the original disc could not be activated with the remote on the copy. I recently discovered that if I use "Always Enabled" for the AI scanner, the problems seem to disappear when I did this. In other words, I get a better quality rip with the AI scanner forced. As I say, maybe I should have known this already. If anyone wants some more info about this, just say the word.