I have been making backups of my dvds and for some reason season four futurama disc 3 and 4 won't back up. I have tried every program that I've always used, dvd shrink it locks up while analizing, and dvd decrypter as soon as it gets to the vob files it slows down and continues to retry.I have backed up my copys of the grudge, and other discs that have the new sony stuff on it, but this is getting frustrating. I have searched the forum and have had no results. Any suggestions would be appreciated.