Eric -
Thanks for the response. This problem manifests itself from your website as well as my own development version, so it can't be something in my local config. This is what I see in Firefox, it's the same in IE8 and Safari:
OK, I actually just discovered what the problem is and you might want to add to your FAQ. I have Kaspersky Internet Security installed and had the option for 'Anti Banner' activated: "Blocks advertisements presented as banners on websites and user interfaces of some applications". I deactivated that option and the gallery works fine.
Thanks!
J.