When I made it to the office, the host computer was up and running, but the Host program icon in the system tray was red and disappeared as soon as I hovered over it. I relaunched the Host program and that allowed me to connect just fine.
The Legacy Capture Mode is activated, that's the only difference in configuration between now and before, but it was working earlier with this mode being inactive, so no idea what the issue really was.
Step by step troubleshooting: -The monitor driver is not installed. -All the connection modes are enabled. -I am the only user and am properly authorized to connect. -Both machines already use the latest version of Host/Viewer. -Using "Legacy capture mode" results in the messages "loading remote screen" and "connection interrupted..." looping without ever managing to display anything for several minutes, and then the remote host went offline and hasn't come back up yet (already 10 minutes).
I will continue the troubleshooting and post an update once it comes back online (I might end up having to physically get over there to see what's going on if it doesn't get back up soon).
Since yesterday afternoon, I have trouble getting access to my office computer from my home laptop. The viewer shows the office computer as "Logged on" (in full control mode) and displays a thumbnail preview of the screen. The separate window that should display the remote screen content remains desperately black. Both computers have only one monitor (so can't be a question of showing the wrong monitor), both run Windows 10 Pro 64bit 1909, the office machine runs Host 6.10.10, and the home laptop runs Viewer 6.10.10. Everything was working just fine earlier this week, there has been no update/change on any of the machines, and I am using a Free license. Thanks for your help diagnosing/resolving the issue.