Taxonomy not finding results

Hi, I have created a custom post type with several taxonomies in my theme’s functions.php file.

Almost all of the taxonomies work fine, except for the one labelled ‘region’. Whenever I search for one, the 404 page comes up.

Any ideas on where to start looking for the cause of this?

Here’s an example of creating the region taxonomy.

$region_labels = array(
  'name'          => _x('Non-US Region','taxonomy general name' ),
  'singluar_name' => _x('Non-US Region','taxonomy sigular name' ),
  'search_items'  => __('Search Non-US Region'),
  'all_items'     => __('All Non-US Region'),
  'edit_item'     => __('Edit Non-US Region'),
  'update_item'   => __('Update Non-US Region'),
  'add_new_item'  => __('Add new Non-US Region'),
  'new_item_name' => __('New Non-US Region name'),
);

register_taxonomy('region',array('gddprogram'),
  array(
    'hierarchical'  => false,
    'labels' => $region_labels,
    'public' => true,
    'show_ui' => true,
    'query_var' => true,
    'rewrite'  => array( 'slug' => 'region' ),
  ));