I've run into an issue after upgrading Boxcryptor to version 2.31.1006 on MacOS Mojave (10.14.6). It seems that there's some kind of conflict with the SIP (System Integrity Protection) which causes system to hang on shut down (black screen, impossible to perform any action).
Disabling SIP - system shuts down as expected
Enabling SIP again - system is hanging again
Manually closing Boxcryptor before shutdown is not causing any conflicts with SIP and is, as for now, the best solution.
Machine : Mac mini 2018 i5
I have another machine (MacBook Air 2014) running macOS Catalina and the problem doesn't occur there.
I will upgrade the newer machine to Catalina in near future and will see if the problem persists.