I backed up some of my DVD's using SHRINK & DECRYPT. Some of the backups would play and some would not. I was using WINDVD 4 to check them after backing them up. At first I thought i had a few bad disks, by the way i am using RITEK 4X +R. I decided to give WINDOWS MEDIA PLAYER a try, and guess what? the disks that didn't play are now playing. Has anyone else had this problem, and if so why does this happen? 6FOOT