[Plugin: Flickr Gallery] lightbox mode fails

We installed the flickr gallery plugin and got it setup. Everything seems to be working fine.

The problem is that the images from a collection are not opening in lightbox mode. The page goes grey and you see a small white box where an image is to be loaded but then something fails and instead the page is forwarded to the flickr site to the page where that image is. The settings all say gallery mode and lightbox.

The only difference here is that WordPress was installed as part of a joomla site using some sort of joomla extension by http://www.corephp.com/