when playing a youtube video from the youtube website it won't play at full screen, it only plays back video from the video player window. When I try to go full screen I only get the audio portion and a black screen. Full screen will play Youtube videos back properly from Internet Explorer or if I play back a video embedded in a website, but not from Mozilla. This has been going on four or five days now and I was hoping it would correct itself, but to no avail. Thank you, Annette