Thanks for the feedback.
If you still got the original dvd, then you may do the following test:
1. Copy the original dvd to your hard drive. You may refer to
http://www.idealdvdcopy.com/copy-dvd-hard-disk.htm to learn how to do.
2. Playback the copied dvd from hard drive with the proffesional dvd player software like windows media player or powerdvd to check if you got the same issue.
Tell us the result, then exported the corresponding bup files both for the source dvd and copied dvd.
Confirm if the link is your exact dvd, maybe we need to buy the same dvd to test.
http://www.amazon.com/Teacher-Unrated-E ... 712&sr=1-3 (pay attention to the region code, edition)
Thanks.