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i am using a macbook air and with yosmite os

At first I could still switch between desktops, just that i could not swipe up/down to access mission control and app exposé. I tried typing in killall Dock into terminal to restart dock, but now i cant switch desktops either and the background is completely black. killall dock just tells me it can't find the process for this user. when i typed in killall -s dock it showed only one process.

is there a way to force dock to start and fix mission control?

  • ok, so dock restarted in the end. no idea how it got fixed, but i was fiddling around with some folders open in other desktops so that might have triggered it leaving this open because i am not sure exactly what happened – affa Oct 9 '19 at 21:45
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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.

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