Comment 25 for bug 858845

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Peter Mertz (frottier) wrote : Re: Screen edge actions set in CCSM (scale/expo) don't work (sometimes) - plugin load-order causes the shortcut loss

Another possible workaround is to re-assign expo edge values session-wise via a script using gconftool.

There is a how-to in this blog post:
http://cannotstunmycat.wordpress.com/2013/03/19/workaround-expo-edge-stops-working-sometimes-in-unity/

On my system this has been a rock-solid "fix" for months now.