Just got a 50.2, and I need to transfer 878gb of files from an ext. hard drive to the 50.2. I successfully moved a few, but now when I go to the Music folder(MAC), CDs that I ripped on the NAD show as individual folders, but the transfer are "stacking"; all on top of each other on one folder icon. And now I can no longer transfer . Do I need to delete the NAD app and start all over again? Does anyone know what might have caused this?