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This question already has an answer here:

I have the mouse gestures such as four finger swipe up shows mission control, or four finger swipe down shows current application's windows.

Occasionally after the computer has been on for a while, the shortcuts just stop working. Is there a way I can fix it without having to restart my entire computer?

marked as duplicate by grg macos Oct 23 '17 at 21:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • This also addresses keyboard shortcuts that stopped working or that you remapped and didn't "take it" and the accepted answer solves that too – Ciprian Tomoiagă Aug 3 '18 at 7:32
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You can restart Mission Control using the following command in Terminal:

killall Dock

This will usually fix the mouse gesture shortcuts.

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