Screen Sharing not responding to input
I have a new iMac Pro upgraded to Mojave. I have screen sharing activated and can connect remotely to the computer. I see the login screen bit it does not respond to either mouse or keyboard input. Same happens if I am logged on. I'm not in observer mode on the client. The client works fine to connect to other computers, so it's clearly on the server end. Firewall is off. Any thoughts?
iMac Pro, macOS Mojave (10.14)