What an annoying problem. I used to love my iPhone. No more. When I plug in headset, the music widget - which is so big it blanks out the entire screen blocking things I WANT to see - and says "Music not playing." Well, duh, I'm trying to make a phone call by replying to what just got blocked out by the stupid music widget. I tried all the suggestions on this thread and even uninstalled the music app. Turned off everything I could find. Nope, some engineer at Apple things I might like to be annoyed like this. Really stupid. I hope they fix it.