I just got a 51UWX20B and noticed it had different settings for Virtual HD 480i, 480P, 540P, & 1080I etc. The problem that I have is now when I press the Virtual HD button at the bottom of my remote I can not get the 480I or P to display....it will only toggle between 540P & 1080I. Does anybody know what I did wrong or how I can get it to display 480I & P again? thanks