Don't see the suggestion to restart between removing and re-adding Netflix in this thread earlier, and I scoured the other older thread we broke off from, https://forums.roku.com/viewtopic.php?f=28&t=104331 , and don't see that suggestion there either. I would strongly suggest Roku contact Netflix about their help article(s), such as https://help.netflix.com/en/node/25892, to ensure that crucial step of restarting is included in suggested fixes, would have saved me a LOT of time and effort.
It's a bug in 7.7. Uninstalling does nothing more to help the issue than just restarting. Supposedly 8.0 will fix it on the TVs. Supposedly. It was also supposedly going to be rolling out to TVs beginning in November. Supposedly.