Problems with hook_menu() not registering

Hello. I'm building a module called user_deco, and none of my menu items are registering with the system. I've built two other modules where hook_menu() works, and I've basically just copy-pasted from them, but it still doesn't work for user_deco. I have thoroughly cleared my caches.

Here's the hook:

/**
 * Implementation of hook_menu().
 */
function user_deco_menu($may_cache) {
  $items = array();
  if (!$may_cache) {
    $items[] = array(
      'path' => 'admin/settings/user_deco',
      'title' => t('Deco settings'),
      'description' => t('Adjust settings for user_deco.'),
      'callback' => 'drupal_get_form',
      'callback arguments' => 'user_deco_admin',
      'access' => user_access('access administration pages'),
      'type' => MENU_NORMAL_ITEM,
    );
    $items[] = array(
      'path' => 'user_deco/gallery',
      'title' => t('Deco Gallery'),
      'description' => t('Shows a gallery of user_decos with the option to buy them.'),
      'callback' => 'user_deco_gallery',
      'callback arguments' => 'gallery',
      'access' => user_access('buy user_decos'),
      'type' => MENU_DEFAULT_LOCAL_TASK,
    );
    $items[] = array(
      'path' => 'user_deco/mine',
      'title' => t('My user_decos'),
      'description' => t('Displays decos the current user has bought.'),
      'callback' => 'user_deco_gallery',
      'callback arguments' => 'mine',
      'access' => user_access('add user_decos'),
      'type' => MENU_LOCAL_TASK,
    );
    $items[] = array(
      'path' => 'user_deco/added',
      'title' => t('My Added Decos'),
      'description' => t('Displays decos the current user submitted.'),
      'callback' => 'user_deco_gallery',
      'callback arguments' => 'added',
      'access' => user_access('add user_decos'),
      'type' => MENU_LOCAL_TASK,
    );
    $items[] = array(
      'path' => 'user_deco/flagged',
      'title' => t('Flagged Decos'),
      'description' => t('Displays decos that have been flagged as inappropriate.'),
      'callback' => 'user_deco_gallery',
      'callback arguments' => 'flagged',
      'access' => user_access('admin user_decos'),
      'type' => MENU_LOCAL_TASK,
    );
    $items[] = array(
      'path' => 'user_deco/add',
      'title' => t('Add Deco'),
      'description' => t('Allows users to add a deco to the system.'),
      'callback' => 'user_deco_add',
      'access' => user_access('add user_decos'),
      'type' => MENU_LOCAL_TASK,
    );
    $items[] = array(
      'path' => 'user_deco/flag',
      'title' => t('Flag Deco'),
      'description' => t('Flags a deco for administrative review.'),
      'callback' => 'user_deco_flag',
      'access' => user_access('flag user_decos'),
      'type' => MENU_CALLBACK,
    );
    $items[] = array(
      'path' => 'user_deco/buy',
      'title' => t('Buy Deco'),
      'description' => t('Adds a deco to a user and subtracts userpoints.'),
      'callback' => 'user_deco_buy',
      'access' => user_access('buy user_decos'),
      'type' => MENU_CALLBACK,
    );
    $items[] = array(
      'path' => 'user_deco/remove',
      'title' => t('Remove Deco'),
      'description' => t('Removes a deco from a user and refunds userpoints.'),
      'callback' => 'drupal_get_form',
      'callback arguments' => 'user_deco_remove',
      'access' => user_access('buy user_decos'),
      'type' => MENU_DYNAMIC_ITEM,
    );
    $items[] = array(
      'path' => 'user_deco/delete',
      'title' => t('Delete Deco'),
      'description' => t('Deletes a deco from the system and refunds userpoints.'),
      'callback' => 'drupal_get_form',
      'callback arguments' => 'user_deco_delete',
      'access' => user_access('add user_decos'),
      'type' => MENU_DYNAMIC_ITEM,
    );
    $items[] = array(
      'path' => 'user_deco/clear',
      'title' => t('Clear Flags'),
      'description' => t('Clears flags from a deco.'),
      'callback' => 'drupal_get_form',
      'callback arguments' => 'user_deco_clear',
      'access' => user_access('admin user_decos'),
      'type' => MENU_DYNAMIC_ITEM,
    );
  }
}

Thanks!