Maybe someone has already reported that, but the post type switcher plugin is beaking things when using in conjunction with the following plugins :
- WP-Help : Plublishing a new Help document doesn't work, publishes a "post" instead.
- Advanced Custom Fileds : Plublishing a new Custom Fields Group doesn't work, publishes a "post" instead.
I can guess it's the same thing happening for both, and maybe other plugins, when publishing a plugin specific post type, instread of saving to said post type, it saves to default "post".
Hope that helps, and thanks for this very useful plugin :)