The really odd thing is that
Firebug can't find that bar in the source of the page... I can't think of any reason why it would be appearing on a single page but not a non-single; I'm going to have to dig through the code some and try to figure it out.
I want to eventually change the breadcrumb to be a widget instead of hard-coded, but that is currently low on the priorities list.
I have to leave for a meeting shortly, but I'll take a look through the code when I get back and hopefully I'll figure out why it's doing that.