Bug#492590: possible fix

[Chess Griffin]

Ok, I found an Ubuntu launchpad bug report that covers this exact
problem. [1]  The problem occurs when there is a pre-existing
~/.gtkrc-2.0 and ~/.gtkrc-mine file.  Moving these files solves both
the thumbnail and the CPU issues.  It might be that I reference a gtk
theme in my ~./gtkrc-2.0 or ~/.gtkrc-mine file that does not exist on
these systems, but either way, those files are the culprit.

[1] https://bugs.launchpad.net/gnome-control-center/+bug/147045

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Chess Griffin
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