I have an iPod nano, 4th gen. I bought some tv shows from the iTunes store, and while shows from one season will sync, I get an error message when I try to sync the next season saying it could not be synced "because it can not be played on this iPod". All the solutions I have seen thus far are for shows downloaded from an outside source and converted to work with an iPod--but mine are from iTunes itself! How do I get them to sync?