I am using DVD Shrink with Nero and getting excellenet results on back-ups of commercially made DVDs but DVD Shrink doesn't work when I try and back up DVDs that I have made myself on Pinnacle Studio 8. I get the following message: "DVD Shrink encoutnered an error and cannot continue - Invalid DVD Navigation structure". The DVDs that I am trying to back up work fine on my PC's Iomega DVD drive using Sonic Cine Player, and my Pioneer player. Has anyone encountered this problem, or know what is causing it? It may be something about the settings that I am using in Studi when I burn the disk.