If you're on a VPN or something like it, the nuts.itch (lol) and ovh endpoints will return HTTP 403 when requested from the desktop app (linux). If you visit them in a browser, you get (yay) the Cloudflare Google CAPTCHA game.
But--winning the game doesn't actually improve the situation for all of the endpoints (ovh, for example). It gets a little bit further at requesting but doesn't actually complete login.
Also, the error log widget is real small? See http://imgur.com/g2KjRc2 for an example.
Anyway, to reproduce: get a trial VPN and run the app. Let it check for updates. Watch it fail. Be sad.