I deactivated and deleted the latest version of the plugin yet the featured post thumbnails on the home page still have the rel="lightbox" attribute instead of the post link. Clicking the thumbnail opens the full image in a normal window instead the post URL.
I've checked the Image Gallery and Post Editor Media Gallery image attributes and there's nothing set for lightbox.
My guess is the rel=lightbox attribute is stored in the WordPress database for the sticky post thumbnails and must be deleted via phpMyAdmin? Can you point me to the database table?