The GConf docs say:

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gconf_client_get_default()

Creates a new GConfClient using the default GConfEngine. Normally this is the
engine you want. If someone else is already using the default GConfClient, this
function returns the same one they're using, but with the reference count
incremented. So you have to unref either way.
Returns :	a new GConfClient. g_object_unref() when you're done.

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currently there are a couple of places where the code does:

foo_bar_func (gconf_client_get_default(), blah, blah);

so the client is not unrefed.