At the moment, none of the items pinned to the taskbar on the secondary monitor (dual monitor) will show. Open applications show normally on this taskbar and I can pin and unpin tasks but the icon does not show. I do not recall what happened at the time they disappeared but I think it was related to an Alt Tab. Any suggestions?

The monitor on the left is #2, at one time I could pin/unpin to the taskbar there and the apps would show on both taskbars but no more. This is a 4K monitor and I switch resolution with DisplayFusion frequently. I think it quit working on one of those switches.

I'd like to say this has been a really handy app for dual monitors with vastly different resolutions (3840x2160 vs 1920x10880)

It's working again. I disabled a monitor (2) with [Alt] [P] and when I enabled it again it started working again. Go figure...