Grand Galleries and Pages

I am a complete newby to all of this, so any help would be greatly appreciated. I set up several Grand Galleries (FIAGallery plugin also installed) and when I go to the Grand Gallery pages section in admin, click on a page to edit a pop up shows page as “undefined”…..what in the worldis that? and how do I get rid of the pop up? It really has not effected the page or the site, it is just annoying. Thanks