Mission Control not working Mission Control isn't working on my Mac. I've tried killing the Dock through Terminal and Activity Monitor multiple times, but nothing seems to be working. Even shortcuts or Hot Corners don't work anymore.

What do I do?
This was happening to me for a long time and I did some research and found out how to fix it. 
Go into terminal and run the following commands. 

defaults write com.apple.dock mcx-expose-disabled -bool FALSE
killall Dock


This should fix all of your problems.