I've tried to delete backups from the iTunes Preferences, but nothing's there. I've checked the Backup folder in the ~/Music/iTunes but it's empty. I've replaced iTunes cache files and plist files from ~/Library/Preferences. I've gone through multiple iTunes updates and OS X updates, and nothing fixes it. It's been months now. Everything else works regarding syncing. Please help, really want to taste that iOS 5 iCloudy goodness.