Hey guys,
I have a solution. Get the version 2.7.9 and replace line #161 with this SQL query:
$sql = "SELECT $wpdb->posts.ID, $wpdb->postmeta.meta_value, $wpdb->posts.post_type FROM $wpdb->posts ".
"LEFT JOIN $wpdb->postmeta ON ($wpdb->posts.ID = $wpdb->postmeta.post_id) WHERE ".
" $wpdb->postmeta.meta_key = 'custom_permalink' AND ".
" $wpdb->postmeta.meta_value != '' AND ".
" $wpdb->posts.post_status = 'publish' AND ".
" ( $wpdb->postmeta.meta_value = LEFT('".mysql_escape_string($request_noslash)."', LENGTH($wpdb->postmeta.meta_value)) OR ".
" $wpdb->postmeta.meta_value = LEFT('".mysql_escape_string($request_noslash."/")."', LENGTH($wpdb->postmeta.meta_value)) ) ".
"ORDER BY LENGTH($wpdb->postmeta.meta_value) DESC";
this works for me.