Well, hell!
As I have discussed elsewhere, I upgraded to the newest Fire TV for my new midrange Samsung 4K TV in my family room and about four days ago everything was working great. Then, on Monday when I attempted to load the Netflix App it wouldn't load. When I pressed the Netflix Icon the screen would go to the gradiated dark grey screen which typically appears for a few seconds while the app loads and then the Netflix logo appears, but the Netflix logo never appears and after about 20 seconds I am back at the Amazon home screen. I tried resetting the Fire TV, testing the network quality, clearing the Netflix App cache, force closing the App, and even uninstalling the Netflix app, resetting the Fire TV, and reinstalling the Netflix app - none of those things made a difference.
So, I went on my PC to my Netflix account and checked to make sure there weren't any account issues, and I could find none. I then tested Netflix on my phone, PC, and even my two older Fire TV devices, and it works everywhere else.
Today, out of sheer frustration I used the Amazon "call me for support" feature to speak to a technical support person who took over control of my Fire TV via screen sharing / remote control and try everything I tried and got the same results. She escalated the issue to the software developers and I hope to hear back tomorrow.
This sucks because I am tired and have free time to watch TV and I've drained Hulu of most of the shows I care about watching and Amazon Prime TV isn't as interesting. There are shows on Netflix I have been wanting to watch, but I cannot. And, of course, the thing I want most is the thing I cannot currently have.