I have a MPMoviewPlayerViewController embedded into an UIView object. When I start the player in the embedded mode everything works fine and as exp
Are you stopping the video in viewWillDisappear: or viewDidDisappear:? Those methods get called when a video enters fullscreen on iOS 6, but not on any earlier iOS versions (a report has been filed at Open Radar for this "bug"). I posted this temporary solution on a similar question:
My temporary solution until the bug is fixed is to check the player's fullscreen Boolean value in viewWillDisappear: and/or viewDidDisappear:. If it returns YES, the movie is entering fullscreen mode and you should refrain from doing anything that might interrupt it.