OK, I disabled both 1) auto-hide for taskbar and 2) window snapping, didn’t seem to help…
So I killed the process, reset the driver by Win+Ctrl+Shift+B, launched the thing and went away to make myself scrambled eggs. When I got back I saw two new progress notifications. Then it “froze” again, but after two minutes it updated the progress notifications again.
That thing might simply be incredibly slow.