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When I set the corners to reveal workspaces/windows, It stops working after a couple of reboots. Why? In addition, my chosen Login screen lasts for 1 second during login and reverts to current wallpaper. Why?

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I was having the same problem. So I found the solution here:
Scale plugin keeps forgetting hot corner settings on restart:
Ubuntu-Tweak use compiz for this tweak. So the problem is the same.

Copied from there:

  1. Run gconf-editor from Terminal or Alt+F2

  2. Navigate to apps > compiz-1 > general > screen0 > options > active_plugins

  3. Move "Scale" to the bottom of the list.

  4. Move "Expo" to bottom right above "Scale" and underneath Unityshell.

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