Well this is weird. I am getting lots of pixelation and audio dropouts on my new 360 install. BUT it ONLY happens on DaveJaVu recordings of Have I Got News for You. Is it possible that these recordings use a different compression?
Update - now happening on Dave watching LIVE TV. This is just not good enough Virgin. This NEVER happened with Tivo. I'll try comparing with HD signals as as suggested these were all Dave & DaveJavu problems on SD.