I find that I mostly use CMD Tab to switch between apps on my Mac and frequently use CMD Space to bring up Spotlight so I can launch apps. Anyway these both suddenly stopped working. I Googled this and the common advice is to go into the Activity monitor and do a forced close on the Dock. This didn’t work for me. I was just about to do a reboot when I noticed that I still had a VNC session running in the Dock. As soon as I quit the VNC session CMD Tab started to work normally again.
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