Hello, I turned on my ipod today and all 8G of music were gone. I had initially sync'd with my iBook, then with my PC, then another Mac (was verified when I called Apple support that this was fine.) When I tried to sync again, a new message comes up that the "iPod can only sync with one library" but a) this was not what I was told when I bought it and b) it worked fine for 3 months sync'd with 3 different computers. Am I missing something? I could understand if this was clear when I bought it, or if I had not been previously using it perfectly for 3 months....now it is all gone, and the memory says 'free,' so I know the music is not somewhere else on the iPod. Any ideas?