I have verified that this is not the same as this bug
try to connect to an unattended client, results in black screen with a white rectangle in the middle and the text 'Connected'
However this text is lying, there's nothing you can do to make the connection work.
I was able to fix this on one machine by logging in with VNC, then dragging the app from /opt into the
System Preferences/ Security/ Privacy/ Accessibility
*I also rebooted the machine, not sure if that is important.
*reinstalling from the Control admin interface does not fix this
*I have not tried an uninstall & reinstall
This indicates that something is different enough between the v19.2 clients and the v19.4 clients to cause Apple's security to vomit and disallow it. I upgraded directly from v19.2 to v19.4 on Centos
Customer support service by UserEcho