Autocomplete widget not working

I created a nodequeue for my "front page slide" content type. I create a front page slide, and then visit the nodequeue admin page. I type the title in the autocomplete widget, and no options appear. If I visit the node page, and click on the "Nodequeue" tab, I'm able to add the node to the queue that way.

What troubleshooting steps do you suggest I take? No matter how many slide nodes I create, no options ever appear in the autocomplete widget.

Could this be related to the way I created the queue, in a hook_update function? (I'm adding this feature to a production site.) Everything else about the queue seems to work perfectly. The queue is used to sort a views page that displays all the slides. Here's my update code:

/**
 * Add a nodequeue for the front page slideshow
 */
function cc_general_update_6003() {
  module_load_include('module', 'nodequeue');
  $queue = array(
    'title' => 'Front Page Slideshow',
    'size' => 0,
    'reverse' => 0,
    'roles' => array(),
    'types' => array('front_page_slide'),
    'i18n' => 1,
    'show_in_links' => FALSE,
    'show_in_tab' => TRUE,
    'show_in_ui' => TRUE,
    'subqueues' => array(),
    'add_subqueue' => array('Front Page Slideshow'),
    'new' => TRUE,
  );
  $queue = (object) $queue;
  $qid = nodequeue_save(&$queue);
  return array();
}