I have a Roku 3 connected to my 975 via HDMI. The HDMI setting is DD+. DTS auto. But I only get 2-channel sound. I get 5.1 from Amazon Prime and other sources. I also get 5.1 if I use my Oppo BDP 103 to run Netflix through the 975.

I have seen posts elsewhere noting that Netflix on Roku uses only DD+, not DD.

The Roku firmware is up to date.

Anyone having/had similar problems.