Upgraded to 2.0.4.23_beta_2019-07-14 on Windows Server 2016. Install worked, server rebooted, but now Duplicati isn’t running, the Tray Icon doesn’t load, I can’t access localhost:8200 (“Page can’t be displayed”). Further server reboots do nothing.
This has happened on two separate Server 2016 servers, so I don’t want to try any more (I’ve another 6 to go!). Upgrade worked fine on a Windows 10 PC.
To answer the troubleshooting question. It doesn’t usually log, so unless you configured that the easiest is starting it from command line by calling the full path to the installed program.
But I’m happy to hear it works weird that the program wouldn’t start until reinstalled, though.