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Fix for not working Exposè/Mission Control

Using the the F3-key should normally activate Exposè/Mission Control. In some circumstances nothing happens when you hit the F3-key or the four finger up gesture.

To solve this problem apply the following defaults write command:

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

Restart the OSX Dock:

killall Dock

F3 and the four finger up gesture will work again.

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