I'm not sure if this has anything to do with recent TheBrain issues on Sierra, but I saw this post about issues with apps that update automatically and Sierra, so I'm including a link. 

I don't know anything more about it, but thought I'd raise it to someone's attention.
nvALT 2.2 take 2.2 (one more time, with feeling)

Then there’s App Translocation. This new security measure in macOS causes some serious issues for apps that update via mechanisms like Sparkle. I’m still waiting to learn more, but in the meantime we’re distributing nvALT via codesigned disk images (DMG) that require the user to drag the app to the Applications folder manually, which is essentially the only thing that Translocation considers a safe install.

macOS 10.14.6
TheBrain 11.0.119

Thanks for sharing this information. We'll consult with our engineers on this.

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