Comment 67 for bug 858845

Fresh 14.04 install, bug still present.
As stated by others, the workaround is to go back to unity tweak tool and turn active corners off an back on.

I'm not really on the position of bringing any definitive solutions to the table, but I'm willing to provide documentation of the error if someone ask for it (and describes exactly what is needed).

This relative "simple stuff" is what damages Ubuntu image on the eyes of new adopters (or potential ones).