Yes, I’ve definitely saved the options. The MapPress meta box option does not appear in the ‘screen options’ section for the custom post type. And I’m not sure exactly how the post type has been registered as I used the “Types- Custom Field” plugin (http://wordpress.org/extend/plugins/types/). But somewhere MapPress is “seeing” the custom post type because it’s offering me the option to display the editor there in the settings page… it’s just that once selected it doesn’t actually appear.
I’d be happy to send over my login if you want to have a look around?