title: MPMoviePlayerPlaybackDidFinishNotification not firing in iOS 4.3
body: <p>I have added an observer for MPMoviePlayerPlaybackDidFinishNotification to determine if a movie has finished playing. It works fine in iOS 5, the notification fires when the movie has reached the end.</p>
  
  <p>However, in iOS 4.3, the notification never fires. Has anyone experienced the same problem and come up with a workaround?</p>