I typed the wrong PIN twice or something, and now Boxcryptor doesn't launch.
Even after uninstalling with AppCleaner, restarting and reinstalling, I just get a dialogue box saying that "Boxcryptor wants to make changes". Then I'm required to type my Mac password, after which I get the dialogue box "Mounting the Boxcryptor disk failed".
I'm on High Sierra v10.13.6, by the way.