I think this is a common issue with the current version from what I've seen from a quick google search. The iTunes Library file cannot be saved. An unknown error occurred (-48). Then it asks to warn again or not, even though it comes up every time I restart iTunes. And I can't add anything to my iTunes. It won't save...Help please. Also forgot to mention that from now on my itunes requires i agree to some TOS every time I open it. Idk if this is part of the update or anything but...used to not do that.