I have a 12'' PB that i had bought 2 months ago. Today, for the very first time I had tried sticking in my headphones and it doesnt seem to fit in all the way. Its a VERY tiny bit (5mm?) but the difference is tremendous because the right ear will have less volume. Its irritating to me. I have tested out 3 other headphones and they all have the same problem. I know the "easy" fix is to simply make the right hear pump out more volume, however I feel there shouldnt even be a need for this. I was hoping this isnt a reoccuring problem for everyone else. If it is, then Ill simply drop it, if it is Im going to the mac store later on the weekend and complain.