I'm watching "Man In The High Castle" on Prime.
Sometimes everything is fine. Japanese dialog or text brings up the English translation in a subtitle box, and the same where there is German dialog or text, the English subtitles appear as they should.
During random episodes, when there are words on the screen, German subtitles will appear translating.
And then when there is Japanese dialog the translations come up in German subtitles.
And the of course when there is German dialog in the show, no subtitles appear at all.
Two weeks ago when I was watching "Upload" this would happen whenever there was any kind of text or signage on the screen, a German translation subtitle would appear.
I have gone through all the subtitle settings on both the Roku Ultra unit, as well in my Amazon Prime subtitle settings. Nothing is set to German anywhere.
When this German subtitle thing does happen, I've discovered that if I pause the show, switch on the CC for a moment, and then switch the CC off again, the German issue goes away and everything works as it should.
At this point, nothing I've watched on Netflix has caused this to happen.
I've asked on the Amazon community boards and they say try here.