Setup Lemur Daemon window not appearing on Mac Sierra

After using the Lemur Daemon for several years, now suddenly, when I open the Setup dialog to connect my Mac with Lemur on my iPad, the daemon setup window does not appear. Whatever window is in focus goes into the background, but I cannot see the daemon setup window.

I switch between using just my Macbook and connecting the Macbook to 2 external monitors, and sometimes windows hide near the edges, so I tried changing monitor resolutions, looking in Mission Control and a couple of other online tips, but nothing worked.