Something else since the update - It is known that Quick Scans are no longer an option (unless you make a Custom Scan as such), but if Quick Scans were scheduled prior to the update, they are still happening per the schedule. The computer was set to shutdown after these scans, but even with those "ghost" scans running and completing, the system is not shutting down. Again, we have this happening on six machines right now - 3 Win10, 1 Win8, 2 Win7.
I will uninstall and reinstall the client on my own workstation and see if that fixes the issue (residual carry-over conflicts from previous version?) or not. Any other thoughts?