Was the cause of the problem identified? For the website I’m creating I actually want the gallery to link to a certain resize instead of the full-size image. (i.e. the problem jami had is the solution to my problem)
I don’t have an example available, but the lightbox code which grabs the image links from the [gallery] tag grabs and displays the full-resolution file at a screen size. So all I need it to do is link to filename-800×600.jpg insted of filename.jpg, for example.