Just to let you know, this is one of the most beloved (and best) plugins!
In the PHP area for advanced shortcodes, it says "Must Be a valid PHP Code in order for it to Work, Also leave out opening and ending <?php ?> tags"
- the funny thing is, when you add the tags it is beautifully colored as php code, and without the tags it is not.
You might already know that, but in case you didn't, well - now you know for sure :)
P.S. also the "Thank you for creating with WordPress." message sometimes jumps up and blocks the shortcode type drop-down list just below the WYSIWYG editor. (Chrome)
Thanks for the plugin and support!