iOS 4.2 which was just released yesterday, brings a lot of new features to the iPhone, iPod touch and iPad- but according to some reports online, it introduces a problem with it. Some users who upgraded to the latest OS noticed that their music library was gone from their iPhone or iPod touch. Users thought they had lost their music collection on their iPhones. Turns out that there is a simple solution to this problem- your music is still on your device- don’t worry about it. All you have to do is hook up your iPhone to your computer, play a song that’s on your phone through iTunes, sync the device again and the problem should be solved. Has this problem affected you after updating your iOS devices? And let us know if the fix works for you.