How disable post box collapse

The class selectors have changed slightly, it’s currently '.postbox .hndle, .postbox .handlediv' (.hndle in place of h3) for 4.1

If that doesn’t help, all I can suggest is checking your browser console for javascript errors.

Ok here is the code I am now using:

/**
 * Disable meta box toggling (collapse/expand) for specified post types
 */
add_action( 'admin_footer', 'wpse_39723_disable_metabox_toggle' );
function wpse_39723_disable_metabox_toggle() {    

    $current_screen = get_current_screen();

    // Array of post types where we want to remove metabox toggling
    $post_types = array(
        'post',
        // 'page',
        // 'my_custom_post_type',
    );

    if( in_array( $current_screen->id, $post_types ) ) {
        ?>
        <script type="text/javascript">
            jQuery( document ).ready( function($) {
                $( '.postbox' ).removeClass( 'closed' );
                $( '.postbox .hndle' ).css( 'cursor', 'default' );
                $( document ).delegate( '.postbox .hndle, .postbox .handlediv', 'click', function() {
                    $( this )
                        .unbind( 'click.postboxes' )
                        .parent().removeClass( 'closed' );
                } );
            } );
        </script>
        <?php
    }
}

There is still no change. Anybody else have any ideas?