Logi Options+ on Mac Catalina 10.15.7 is broken!

On my Mac Mini running Catalina, Options+ was working flawlessly with Flow, enabling me to move seamlessly between Windows 10 and Mac.

Now, Options+ on Windows reports that the Mac Mini is disconnected. And when I manually switch my mouse and keyboard to the Mac and try to launch Options+, I get an eternal spinning "wait" icon, but the app never loads. Finder says this is the logioptionsplus.app v.0.60.3677.

Thanks!