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Any idea on how to resolve the unreliable Hot Corners?

27" iMac Core i3, OS X 10.7.2

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Possibly related: apple.stackexchange.com/q/46994/10410. –  zpletan Mar 31 '12 at 18:58

7 Answers 7





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Just found the easiest solution! (for me at least)


Hope that works for you!

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Try this:


mv ~/Library/Preferences/com.apple.dock.plist ~/Desktop/


killall "Dock"




In Terminal:

rm ~/Library/Preferences/com.apple.dock.plist

mv ~/Desktop/com.apple.dock.plist ~/Library/Preferences/

killall "Dock"

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I have an external Samsung monitor attached to my MB Pro 17" late 2011. I had the "display port" cable plugged in, and had chosen "mirror monitors."

It occurred to me that the reason "Hot Corners" had failed, is that with the monitor connected to the display port, the MB pro may be "seeing" the monitor, NOT THE MBP's display. When I checked the monitor, it showed is as being connected to the display port, even though it was turned off. I removed the cable and plugged it back in: voila, HC's are working again. I use the monitor for watching download video. In any case, I have left the monitor plugged in, and will carry on to see if I can "induce" the failure. Should I be able to replicate the fault on a regular basis, I will report the result here.

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After my 'hot corners' and gestures on my trackpad stopping working, I just open the app named 'Mission Control' once, then they recover to respond

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