Thank you for your help, Patrick. I found I had "Run as Administrator" checked in settings. It seems to work properly now.

I have been using Dexpot for a while and like it. Recently I had a glitch and have had to configure it again. I seem to have lost the ability to copy or move icons between desktops using Desktop Manager as described in the quick start guide sections 10.1 and 10.2. I expect I need to change a setting...