I'm trying to understand this. I'm using hdmi to my hidef tv. When the tv transmission is 16:9 I get a 16:9 picture (bbc etc...). When the transmission is 4:3, I get a centered 4:3 image with pillar box bars down each side. This seems to me like normal behaviour but i've seen various posts where folks are complaining. Please explain to me what the behaviour should be.