A new issue seems to have arisen with a Panasonic screen, model as in title. I have a Denon 2910 connected, with the denon set to 16:9 ratio. However, when playing acertain DVD-Video disc where the authored ratio is 4:3. because certain images are letterboxed Wide, it is resetting from 4:3 Aspect Ratio to WIDE instead. How can I stop it trying to be "helpful" please? It's doing my ****ing head in.