rsavard

Yeah! Thanks a lot. I needed to add $wpdb to global $mam_global_join; and put $mam_global_join inside de function has you told me.

function mam_posts_join ($join) {
	global $wpdb, $mam_global_join;
	$mam_global_join = "JOIN $wpdb->postmeta metax ON (metax.post_id = $wpdb->posts.ID AND metax.meta_key = 'myPosts_displayed')";
	if ($mam_global_join) $join .= " $mam_global_join";
	return $join;
}
add_filter('posts_join','mam_posts_join');

$args = array(
	'meta_key' => 'myPosts_order',
	'orderby' => 'meta_value_num',
	'order' => 'ASC'
);
query_posts( $args );

Thanks again for your help!

This is strange beacuse when I put…

$args = array(
	'meta_key' => 'myPosts_displayed'
);
query_posts( $args );

..it’s work well. Except that this time I don’t have the order. So the meta_key is working.

I’ll continue searching and I’ll post soon as I find something.
Thanks for your help