I noticed when looking for a fix for my own Netflix issues with the Nexus Player, that a lot of people had gone back to old versions of the app. For me, at least, the 10/13 update to Netflix fixed the 5.1 surround sound issue, I now get Dolby Digital Plus from Netflix 2.4.0 Build 1032 on my Nexus Player.
I thought that those who had turned off updating because of only getting stereo might want to know.
EDIT: Also of note, I never approved any updates or got any prompt, which I thought Android always did for an update. But I am also on 6.0
Did they ever fix the bug where it would log you out if a TV episode auto-played after the previous episode finished? After a while I putting up with that problem I switch to my fire TV stick, but it's not always as great as the Nexus Player.