It’s not enough to define areas and put metaboxes in them, you must define the layout via the current screen.
For example, when displaying a dashboard esque widget area on my custom option page, the first things I have are:
global $screen_layout_columns;
add_screen_option('layout_columns', array('max' => 3, 'default' => 3) );
$screen = get_current_screen();
wp_enqueue_script( 'dashboard' );
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