If you install a certificate on your server and have a user login all pages with SIG or SIG Pro content will display a message stating some of the content is not secure. If you select to not accept the unsecure content the gallery does not work. If you accept it you are reprompted with the message each time you load a page with SIG or SIG Pro content. I attempted to get support for this for SIG Pro and I was told my site didn't appear to need SSL. (http://forum.joomlaworks.gr/index.php?topic=10010.0) There was no support provided or even and admission that the tool doesn't support SSL. If you have uses logging into your website then you need SSL to protect passwords. If you use SSL then you can't use this tool and you can't get support even with the Pro version.