Aha, problem solved! It seems there is a typical issue with Netflix audio on external devices. I read a thread where Panasonic owners were told to contact Netflix to solve the problem and vice versa without resolution. Interestingly this is not just a Panasonic issue. To solve the problem I simply activated the Netflix function on my Oppo 103D and the audio plays just fine through that device.
Why no audio from Netflix?
I use a Panasonic TC-P50GT50 plasma tv and have a toslink cable running from the audio out port to my DAC which then is connected to my two channel system. I get great audio when playing Youtube but no audio when playing Netflix. Anyone know why? Is the Netflix audio stream incompatible somehow with my DAC? The DAC is a Simaudio Moon 300D.