I've beeing using the live view function in te Canon Eos Utility 3 with no problems, but suddenly one day stoped working. All the program and thetered shooting works ok, but not the Live View function, the screen in the computer is greyed out. This happens also with an USB cable or with the wifi function.
The camera works perfect, with or without live view.
In one computer (mac Air 2015) stoped working and in the other (Mac Mini 2012) still works ok, same OS.
The camera is a Canon eos 5d Mark IV, and th os is Mac Os Sierra 10.12.6
Please can anyone help me!
Is your installed version of the EOS Utility the same on both systems?
While you continue to diagnose / troubleshoot... Hopefully you have employed Time Machine and can revert the system to a previous point in time when Live View worked.