Startup movies playing in windowed mode when game settings are set to fullscreen

When launching a game that is set to play in fullscreen, the game does not enter fullscreen mode until after the intro movies play.

This was also mentioned on UDN: https://udn.unrealengine.com/questions/232840/media-framework-umg-movie-not-playing-general-movi.html

Game start Playing Movie screen can not into fullscreen mode.

Game start Playing Movie screen can not into fullscreen mode.