WDTV Live optical 5.1 but no sound on netflix

Hi all, been a long time WDTV users and just upgraded my first gen player to the Live.

Love all the apps this new player has. My current setup is HDMI to TV, Optical to receiver for sound.

5.1 and DTS all works well but if I watch netflix that doesn’t have a 5.1 source or a Youtube video, there is no sound.

I would have to go back to home screen, setup and change the sound to ‘stereo’ only.

Wondering if theres any way around this, seamlessly or for the player to go into Stereo mode without having to switch.