All of a sudden (noticed this last week) my picture is coming in too big, cutting off picture on bottom and top of screen . I tried all of the screen sizes (theaterwide 1, 2, and 3, Natural, 4:3, was in Native). The Full size option is greyed out. Why is this greyed out...? It wasn't before. Any Ideas on why this has changed on me all of a sudden...? Could I be receiving a different kind of signal from my cable provider...? Anyone run into this sort of problem...?