I'm having similar problems. I do not, however, get any errors or warnings in the log. Using the same ISO-file and media in a different computer with a different program I can burn a DVD that works perfectly. Also, using a different program for burning the disc on the same computer, on the same type of media, works perfectly. When using ImgBurn though, the disc won't play properly on a standalone DVD-player (no problems playing it on a computer).