Query posts by meta value date

[Post title de-capped. Please do not shout at us.]

Hi there,

I’m trying to get my posts filtered by post type, category and date (custom field – ACF).
I think my query is correct, yet no results. By looking into WP post list in Admin area I can confirm the post I’m searching for exists.

Here is my code and print

$press = new WP_Query
			(
				array
				(
					'post_type'    => 'press',
					'post_status'  => 'publish',
					'cat'          => 8,
					'post__not_in' => 413,
					'meta_query'   => array
					(
						array
						(
							'key'     => 'sx_press_review_date',
							'value'   => array( 20110101, 20120101 ),
							'type'    => 'NUMERIC', // TRIED: DATE, SIGNED, NUMBER
							'compare' => 'BETWEEN'
						)
					),
					'orderby' => 'meta_value_num',
					'order' => 'DESC'
				)
			);

part of the print comes like:

[meta_query] => WP_Meta_Query Object
        (
            [queries] => Array
                (
                    [0] => Array
                        (
                            [key] => sx_press_review_date
                            [value] => Array
                                (
                                    [0] => 20110101
                                    [1] => 20120101
                                )

                            [type] => NUMERIC
                            [compare] => BETWEEN
                        )

                )

            [relation] => AND
        )

    [request] => SELECT SQL_CALC_FOUND_ROWS  wp_posts.ID FROM wp_posts  INNER JOIN wp_postmeta ON (wp_posts.ID = wp_postmeta.post_id) WHERE 1=1  AND wp_posts.ID NOT IN () AND wp_posts.post_type = 'press' AND (wp_posts.post_status = 'publish') AND ( (wp_postmeta.meta_key = 'sx_press_review_date' AND CAST(wp_postmeta.meta_value AS SIGNED) BETWEEN '20110101' AND '20120101') ) GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC LIMIT 0, 5
    [posts] => Array
        (
        )

    [post_count] => 0

Can anybody tell me if there is something missing?

Thanks
Peter