Whenever I watch a DVD movie when there is a part in the movie where the room is dark or the picture in general goes to black/dark the picture looks distorted or a "burn-in" type image. Outside of this when every thing else looks fine. I have a Panasonic progressive scan DVD player but I noticed this on my old DVD player as well. Is there something wrong with my connections or picture? Or is this just the way certain DVD's are.