WMP 12 Black Border (Bars)

Hi in WMP 12 when watching a video I get a small black bonder (bars) of about4 mm around all sides. It happens in fullscreen on both 16:9 and 4:3 videos. I have the video resolution on Windows set to 1080p @60hz and In Windows Media Center it's set to 1080p @50hz. It does the same for 60 50 30 or 25hz videos. I play a lot of 50/25 hz videos as in Australia. In other players (iTunes for...