I have never been able to successfully burn dual layer with DVDFab. I thought maybe it was my burner. I had a Samsung SH-162L, which by most accounts is a pretty good burner. I just installed a new Pioneer DVR-112D, which I have read good things about and is not supposed to be a picky drive when it comes to media. I’ve tried everything I can think of: VSO engine, Nero engine, packet and not, Full Disc vs. Clone and nothing seems to work. I am currently not using the greatest media, Dynex (Best Buy generic), which could be part of the problem, but I used to burn DL with that brand on my old Pioneer burner a few years ago using Decrypter and hardly ever had issues. I’m on my way to Best Buy now to grab some Verbatim media, which I’ve always had success with, but I’m open to any other suggestions.