It seems that these issues are related, if I scroll to the right the content becomes centered. So it seems that the thumbnails not being hidden is what is causing this to happen. Please post back with direct link to the gallery that is not included on a page so that we can see it by itself. I have a feeling that there is a css conflict occurring but I would like to check on this first to get a better idea. Also, do you have a link or copy of the page without the gallery code included in it?