Since the 220.127.116.11 update, the custom field date picker in the custom post type screen have stopped working.
In fact, it appears that all ajax scripts are broken on this screen. For example, I can't add a new item in the custom taxonomy panel in this screen.
Everything works fine in the post and pages editing screen. Only the custom post type editing screen.
If I look at my developer tools, there's an error on the custom post type editing screen (see attached screenshot)