I've followed the steps for using an image for a watermark. The image just simply won't show. It's a transparent PNG. The text watermark works fine.
I've reinstalled NGG twice. Running WordPress 3.8.1.
However, when I got into Gallery Settings and try to set the water on the single image and hit save, i get this error:
Fatal error: Call to a member function save() on a non-object in /var/pub/www/www.landisllc.com/htdocs/blog/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/nextgen_gallery_display/mixin.display_type_form.php on line 55