In the past week, the existing unattended support client's computer is black when I log in. Their computer says I have keyboard and mouse control but I can't see or do anything. They claim nothing on their end has changed but I'm guessing they applied an update.
I've had this same issue with attended sessions - I usually end up going to the menu > screen sharing > stop sharing and then again back to it menu > screen sharing > share screen and it loads up after that.
we have the same problem. only one PC. windows 10. vmware. we can see the mouse. we can login.....but basically a black screen. we can RDP to the client - and open a VMware console on the PC. but gotoassist is black. we tried the stop/start of screen sharing and that did not make a difference.