Maybe I should be weary every time I do one of these shady Apple updates on my 3-year old Mac running 10.11.5.
Suddenly, the shortcut to paste, ⌘ Command V, stopped working for me. But all other shortcuts using the ⌘ Command key still work, such as Copy, Cut, Find, Minimize, etc. Paste still works if I do it manually with the mouse by going up to Edit and clicking Paste.
Even when I log into another user, same problem. And when I am in Recovery Mode, same problem. And I don't think I have any recent add-ons, as far as I can tell.
I restarted several times and reset my Keyboard in System Preferences. I even tried a few random code stuff in Monitor that I found on other forums. Nothing has worked.