I get this message about 90% of the time upon opening iTunes or plugging in my iPhone when iTunes is not open. I have searched Google and MR and haven't found anything useful except that it means "something very bad" happened to my iTunes library. But I've been getting it forever (only now am I asking for help) and have never noticed anything wrong. It's just annoying because it takes 3-5 minutes for iTunes to open when this happens. Solutions?