OK, so I have a few Apple TVs around the house and for that reason I like to have my mac open iTunes upon startup. The problem is, if iTunes cannot find your library location, it reverts back to the default /users/[user name]/music/iTunes/iTunes Music for your library location. If you have your library on an external drive, iTunes inevitably launches before your external drive mounts. Therefore iTunes can't find it and changes its settings. Its very annoying if you don't catch it before you import new content and then have to go about moving it. This is probably a common problem and I'm wondering if anyone has found a solution.