I was having this exact problem after the upgrade to Enterprise 24. For me, it turned out that the WMI service was corrupt. My system info was totally blank, and I could not stop, start, or restart the WMI service. When I went to Services and Applications" and select "More Actions" -> Properties, all the WMI items were "invalid class." I used the information in the link below to correct the problem, then restarted the workstation: 

https://learn.microsoft.com/en-us/answers/questions/684166/failed-to-initialize-all-required-wmi-cla...

After restart, the GUI popped up, and I was able to scan the necessary folders to get multiuser working again.