I'm the site admin and the NextGen Public Uploader works very well for me. But a visitor is unable to upload an image. I do not have the WP Login plugin installed - is this a requirement for visitors to upload images? I'm thinking of unchecking the "Anyone can register" box. Would this setting have anything to do with a visitor not being able to upload a photo? I notice on the NextGEN Uploader site, you state "Any visitor that is logged into your website will be allowed to upload an image to the gallery."