Bob, I took a look at your site and:
1. Your theme is already using a lightbox script
2. Responsive Lightbox is a second one (so we have a confilct) or third (I deactivated one for you)
3. To see how it works and the way it conflicts change option Selector in Responsive Lightbox settings from lightbox to prettyPhoto
My suggestion then: digg into the theme to disable bultin lightbox and then use our plugin. The ligthbox script must be only one per page.
