I plugged in my ipod to the computer and it wouldn't let me add an album to the ipod and all the songs were grey. I found out that the manually manage music box is unchecked, and I always do it that way instead of syncing. But when I tried to check it, a window pops up saying it is synced with another library and asking if I want to erase this iphone and sync with this library. I dont want to accidently erase all my songs because it takes forever to figure out which ones I had on the ipod, so i dont want to try anything that might do that. The weird thing is that it says I synced with another library which I dont even do on my own computer. Any help would be appreciated.