Ok, I just got into the world of HDTV today. I received my New Panasonic PT-47wx49 and hooked up an RCA DTC-100 DirecTV receiver. I called DirecTV and I'm all setup with the HDTV channels they offer and they look great. Now here's the issue. If I'm watching HDNet and I change to a regular DirecTV 4:3 channel, I'd say 1 time out of 10 the picture gets all distorted and everything looks off. It's like the whole picture shifts drastically to the right and everything gets dark and you cannot see anything. I did notice that when I switch channels and see it lock on 4:3 in the guide, everything will be fine. It looks as if it can't lock into the signal. Has anyone had this issue before? This was an open box receiver so can it be defective? Or do I possible have something set wrong? I set it for 16:9 crop because If I set it to letterbox, I get grey bars on the top and bottom. If anyone has seen this before can you offer any suggestions? Thanks.