Look forward to implementing this plugin on our site. It does seem something might be awry in the html5presentation post type declaration. When also using the plugin Post Type Switcher (http://wordpress.org/extend/plugins/post-type-switcher/), if i attempt to update a presentation slide, it auto switches the post type to a standard post. Post Type Switcher (as well, as other plugins ... e.g. Role Scoper) are not recognizing html5presentation as a registered post type. i'll try and mess around with the declaration a bit on my own, but this would be a great fix for future releases. Again, thanks!