I have an app that has a few pages with a web browser control on them. The web browser control contains a web page with a YouTube video player loaded in it, thumbnail preview with play button, standard YouTube player HTML. When you click on the player, the YouTube player is launched (that is, you exit my app while the browser launches the YouTube player app). I just got a bad review from a user in the USA complaining that despite the content being good, the videos don't play full-screen. I have no control of this since my app is no longer present when the YouTube player takes control. On my phone, and as far as I know all my other users, they do play full screen. What could be the reason that this particular users phone doesn't play the videos full screen?