Here is the solution to a DVD that will not burn. (Keep in mind I am only providing this information for users who legally own DVDs, not pirates).
1. Insert DVD into MAC and let it play.2. When the actual Movie (not commerials/menu/etc) starts playing, move your cursor to the top of the screen where the menu is (might need to press mouse) and choose Go->Title and look down the list to find the title that is checked. Keep that number fresh in your head.
3. Open up Handbrake and press cancel – Do NOT select a source
4. Select File->Open Source->Select your movie
5. Enter the Title number in the box that pops up
6. Now rip away….