Hi! I'm having a problem with the picture on my TV. I'm not sure what's causing it. The problem is whenever there is a bright scene immediately followed by a dark scene in a movie or show the picture becomes unstable and rolls vertically for a split second. It typically occurs during vivid explosions and TV commercials. It only happens when I'm watching a video source through the A/V (composite) cables on my TV, whether it's a DVD or VCR player. I've never had this problem before when I just had my VCR hooked up to my TV through the A/V jacks. I first noticed it when I hooked an A/V switcher up. (At the time I was using a 20 year old audio receiver.)I thought maybe the switcher was over-amplifying the video signal. Now I have a home theater A/V receiver but I still have the problem. Here is my current (modest) setup: I have a Panasonic DVD-RV30 DVD player (non-progressive scan) (2 years old), a Fisher FVH-4903 VCR player (10 years old), a Sony STR-DE675 A/V receiver (1 year old) and a RCA 20" TV (12 years old). The TV only has a RF input and one set of A/V inputs. Throughout my whole system I'm only using standard A/V (composite) cables. Does anybody know what could be causing the problem? How can I resolve it? I hope I included enough of information. Thanks!