I have just purchased and had installed a DTC100 to go with my Pioneer Elite PRO-710HD. The images on the hi-def channels (199 & 509)are tall and thin as if it's a 16:9 picture being fit on a 4:3 screen. However the TV is of course a widescreen television. I have set the DTC100 for 16:9. What do I have set wrong? I've tried everything I can find in the manuals. Please help!