"Active Screen Corners" no longer works. Why???

I have been using "Active Screen Corners," but it suddenly doesn't work. Keyboard shortcuts for it works, though.
Anyone who knows why?

The 'Active Screen Corners' are written to the 'com.apple.dock.plist' file.
/Users/yourhome/Library/Preferences/ com.apple.dock.plist
Move the file to your desktop and restart.
If that doesn't help, put the file back and restart again.
Good luck,
Tom

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