And after saving the changes to page the image didn't need in the actual page either..
But I would name to update to version 1.6.6. since the year for selecting additional post thumbnails is easy to use and stylish with 1.6.6. version when compared to 1.3. version..
Now you also need to add the snippet to theme's function.php.. if class exists ' MultiPostThumbnails { MultiPostThumbnails array 'label => 'Secondary Image 'id => 'secondary-image 'post type => 'post 'post type => 'page }.
To add the meta box to other post types just add it to the snippet.. 'post type => 'event will add it for Events Manager for example.
Read more