I had the same problem, in my case post type was “apartaments” and act like “page” but don’t know why plugin didn’t get it, so.. I fix it by myself
1. open easy-fullscreen-slider/settings_post
2. find (in my case line 19)
public function efs_register_meta_box(){
3. after
add_meta_box('efslider_meta_box', 'Easy Fullscreen Slider - Settings', array(&$this, 'efslider_meta_box'), 'page', 'normal');
4. add (replace YOUR-CUSTOM-POST-NAME with your custom post type)
add_meta_box('efslider_meta_box', 'Easy Fullscreen Slider - Settings', array(&$this, 'efslider_meta_box'), 'YOUR-CUSTOM-POST-NAME', 'normal');
5. that’s it. In my case plugin defaults wasn’t passed (to custom post), so check it before panic
