While using the WP admin and you drag a field group, WP makes an AJAX request with the action “meta-box-order”. This causes the built in action on that request to run which saves the order. The ajax action I posted fires before the built in WP action because the priority is set to 0 (zero) and the one for WP is set to 1. The new action prevents both the saving of the meta box order and the internal WP action from firing.
The only way to get them “unstuck” is to delete the user’s meta box order entries in the DB. There isn’t any real way to fix this without working directly in the DB.
The code I posted will prevent them being moved in the future. Or I should say, if you add the PHP part then the boxes can be moved but when the page reloads then the boxes will be back where they are supposed to be. If you also implement the JS code then the boxes can never be moved.
