This is happening a lot now. I end up having to close Cubase, close midi server, close windows midi, restart all and that does not always work. I sometimes do this 2-3 times, it takes like 10 or so minutes to eventually get it to work. (Windows 11, Cubase 15 Pro, latest updates on all)
This may have something to do with Windows Midi services, but not sure. It does give me other problems.