gallery plus and lightbox

I am using WP 2.6 and Gallery Plus plugin 1.1.0 and Lightbox 2 2.7.7 Single picture posts can be viewed with Lightbox but a gallery of two or more pictures reverts back to the WP gallery default. I am assuming Gallery Plus is not working since I have “link to full size enabled” and I still get the thumb, medium, then full structure.

Is this a problemd native to WP 2.6 has anoyone else had such problems? I have another site using the same system and that site is still in WP 2.5. Any help is appreciated.