Shameless series 3 - 'invalid start block code'. HELP?

Shameless series 3.

This is 3 discs. On all 3 I get the same problem at 7 or 8% - DVD Decrypter reads this as an error and keeps trying to read it but keeps failing, clocking up a good few hundred errors. If I try to copy direct with Clone DVD then I’m told that it’s an ‘invalid block start code’.

DVD Shrink also fails to read it. Is anyone familiar with this type of thing and are there ways around it?

Moved to copy dvd movie forum.