I upgraded my OS from Mountain Lion to Yosemite yesterday and now Mission Control and Cmd + Tab aren't working anymore. Clicking mission control icon doesn't do anything, although I still have 4 spaces automatically opened upon starting the computer. Also, for instance, when I am on screen #1 and Chrome is opened on screen #2, if I press Cmd + Tab to change to Chrome, the menu bar at the top of the screen will change to Chrome but the screen will remain on screen #1.
So far, I tried, but without success:
- Killing dock process using "killall Dock" and "killall -kill Dock" in Terminal
- I made sure no other updates were available
- Browsed internet a few hours to try to find something, but found nothing successful
- F4 shortcut doesn't work neither
My computer specs are the following:
iMac 27 inches, late 2009, 2.66 GHz Intel Core i5, 8 GB DDR3
Would anyone have any suggestions?