I see nothing but a large space, however I do use an ad-blocker add-on for FireFox so I never see ads, anyway.

EDIT: However, when I open PT in an IE-tab within FireFox (basically, opening PT in IE) it does show up for me. So I will confirm that it shows up, just not in FireFox because of my Ad-Block add-on.

EDIT2: And I will also add, whether I could see the ad or not, I don't mind an ad here or there for sites that I support and trust. It's the sites that just become grossly overrun with ads that make me annoyed.