I have removed the channel and redownloaded, system reset my Roku, checked for updates on Roku and Netflix, logged out and back in and still cannot get farther than the black background with red Netflix screen. Netflix opens just fine on my phone but not tv via Roku.
Same thing started happening to me yesterday on two different devices (a Roku Ultra and a Hisense RokuTV). I think there must have been a bad update? Netflix was no help. I also rebooted, uninstalled, reinstalled, unplugged the Roku, etc. No help. Netflix works on other devices, network tests inside Netflix show it connects fine.
I have the same problem and got no where with Netflix customer service I even tried to cast it from my phone that didn’t work either