If you were using your PC while your file was encoding, it can mess up the encoding abit but if you were not then it would be fine. It could mess up when you are burning the DVD towardsa the end. This happens all the time if you use cheap media. To stop this happening, make sure your DVD files size is below or equal to 4.35GB. Alternatly, it could be your ASPI drivers. Always make sure that your ASPI drivers are up-to-date and the latest build. This makes burning and ripping alot more stable while providing consistency. Good luck
ASPI drivers are used for an interface between your DVD drives etc and your DVD software. These are important files which make all the difference when backing up DVDs. Get ASPI drivers here: http://download.com.com/3000-2098-10161912.html Good luck