save_post hook not triggered in WP v3.6.1

Try changing your content and saving again. This will trigger the action. save_post is only called if the content has changed.

To come in before this is checked, you can use the pre_post_update hook.

add_action( 'pre_post_update', 'saving_metabox' );
function saving_metabox( $post_id ) {
    die('test');
}

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