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Helpful answers
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Oct 1, 2016 10:15 AM in response to adburke1by explore360,Solution (for me):
http://apple.stackexchange.com/a/51184
The problem could be related to a corrupted Dock Preferences file (Hot Corner settings are stored with the Dock preferences). If this is the solution, as a part of it, you will end up having to reset most if not all Dock related settings (scroll bar visibility, scroll bar behavior, auto hide, Dock screen position, icons in the dock, etc.).
Try this:
Open Terminal (Terminal can be found the Utilities folder. To locate the Utilities folder, in Finder, click Go -> Utilities) Type in the following commands:
mv ~/Library/Preferences/com.apple.dock.plist ~/Desktop/ killall "Dock"At this point, open System Preferences and reset your Dock preferences and set the hot corners. Hopefully this will work for you.
Command Explanation: The first command moves the existing Dock preferences file to the Desktop to serve as an improptu backup. The second command quits the Dock. Mac OS will instantly reopen the Dock with a fresh preferences file.
If this did not work, you can optionally restore your old preferences file with the following commands:
In Terminal:
rm ~/Library/Preferences/com.apple.dock.plist mv ~/Desktop/com.apple.dock.plist ~/Library/Preferences/ killall "Dock"