Make sure Netflix has all of the same codecs installed. If you're asked about non free formats or codecs, say yes. You want them.
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.