Plugin does not work for me when used in gallery

I’ve tried testing the plugin using the theme I’ve written, the default twenty-whatever themes, on a custom post type I’ve made and on the regular post types, whatever I try the images don’t expand lightbox style when I click on them.

However, when I add rel=”lightbox” to a single image the plugin does work, so it seems to be an issue with the gallery shortcode.

The method I create the gallery is to upload images to the post and then in the upload media window I go to the gallery tab and click insert gallery. This is the same as using the gallery shortcode I think.

http://wordpress.org/extend/plugins/wp-lightbox-2/