Like many Mac users, I use hot corners to start my password protected screensaver when I’m ready to walk away from my desk. Seemingly out of the blue, I was unable to use hot corners any longer. I tried changing the settings, added another hot corner, etc, and nothing seemed to work. Finally after much googling I found a thread on apple.com with other people having the same problem. Most of the solutions said to reboot which I didn’t really want to do, but eventually someone else found a way to fix the problem:
a) Open up Activity Monitor (/Applications/Utilities/Activity Monitor)
b) In the search filter type “Dock”
c) Select the item in the list who’s Process Name is “Dock”
d) Click on Quit Process.
The Dock and Expose will be restarted and the problem should be solved.
Give that a whirl and hot corners should start working again for you.
By Chops April 8, 2011 - 5:11 pm
this has been happening to me too, since about beginning of march as well. Must be a problem with the update (I’m running snow leopard). It’s never happened before in the three years I’ve had this laptop, but in the last month or so hotcorners just randomly quit doing anything. This worked though! Thanks
By Ross April 11, 2011 - 2:46 pm
Brandon, thankyouthankyouthankyou. Worked great. Why doesn’t Apple post solutions like this on their boards when something is unsolved, I wonder.
By Kenn May 2, 2011 - 3:34 pm
Thanks so much.
By Marcus May 27, 2011 - 12:47 am
Thank you for this tip. I have been figuring this out for a few days now since I upgraded my Mac.
By Rob July 16, 2011 - 8:16 am
Dude thanks, I cannot lie without corners.
Awesome!
By Alex Coplan May 8, 2012 - 1:22 pm
You can also just open up Terminal and type “killall Dock”
By Bill May 16, 2012 - 1:09 pm
@Rob: So now you can lie!
By Bill May 16, 2012 - 1:09 pm
Thank you SOOOO much for this awesome tip! Works like a charm!!!
By Dave May 31, 2012 - 11:30 am
Mate. THANK YOU! I use hot corners all the time to show desktop, turn screen off instantly, start screensaver and show all same-app windows. I was getting really narc’d that such a basic bug was plaguing my daily habits. Once again, THANK YOU!