I'm having problems with mactheripper. It has ripped quite a few of my dvds, but there are some that won't work. The one I'm having a hard time with right now is the Davinci code. It will rip a couple of hundred MB and then stop. It says read failure, mirror failure, and then onto disc error. The disc is brand new. No dust or damage. I'm using a imac with a pioneer dvr. I also have a g4 powerbook and it doesn't work on that either. Any suggestions?