Wondering if anyone is having the same problem I am. I have a 2006 Yukon Denali and, at times, am receiving a "damaged/scratched disc" message from the navigation system, even though the disc appears to be just fine. They replaced the unit under warranty and that didn't fix the problem. Now, they're telling me that the disc is my problem and that a new one is in the ballpark of $500. Why they're using a DVD disc for the nav system is beyond me, but am wondering if I'm the only one getting this message. Anyone else having problems with theirs?