I own this program and have been using it since my 30 gig video and every once in a while i run into a problem with a dvd or two. not often, but i just rent movies and then copy them, and i do it a lot, ( have over 900 copied ), and that happens sometimes. there is nothing that i have found that you can do, except try the same movie, but from a different disc. if it is rented, tell whoever you rented it from that it wont play in your dvd player, and you would like to try another copy, and if it is not rented, try to borrow a copy from a friend. If that doesn't work, than the dvd will not encode properly with that software. Other than that, enjoy the software, i love it and it works great.