I have a Viera TV and Tivo box. There are no problems with sound, except for iPlayer - my set up is:
Optical out from TV Tivo box to optical splitter, from there to Soundbar, and also to DAC for headphone use. When I access iPlayer, I get the picture OK, but continue to get the sound from whichever TV channel is selected on the VN remote - not both, just the TV sound.
Can anyone suggest what's wrong, cos I'm stumped!!