I'm using CFT 2.0.5 now. Updated from 2.0.4 that was doing the same:
When I go to the "Add New" Page of any custom of my post types, the custom fields metabox is apearing empty. Otherwise when I'm editing a post (of any custom post type) the custom fields metabox are loading normally with all the custom fields I've defined.
Any idea what is happeing?