Hi I've just purchased a yamaha rx-v677 and I'm having a few problems. I will start with my setup. I have a 5.1 surround with active sub connected to my tv with optical. when my tv is playing from freeview the amp changes from Dolby digital to pro logic 'll constantly the same happens when I play a movie from the built in plex player if it's a Dolby 5.1 source or a acc source but if the source is dts the display shows dts. I can't figure out why it changes on Dolby but not on dts. all I put would be greatly revived thanks.