Imagine my surprise when my 35 GB music library just disappeared from my iPad 3! It appears that all is fine on iTunes on my main computer. Syncing via USB or WIFI seems to not replace the songs on the iPad, however. So what broke it? I have Backup to this computer selected, as well as "open itunes when this ipad is connected and sync with ipad over wifi. Some songs are checked, others are not, but for this ipad I do not have "sync only checked songs" selected. This is messy. What may have deleted the songs from the ipad?