Messages scheduled through the Graph API are often not published.

Hi, I am using facebook php sdk to post on my fan site. I am trying to plan these posts in the future. However, I run into some problems. Here is my code

<?php
// This code is just a snippet of the example.PHP 
// from the PHP-SDK <https://github.com/facebook/facebook-php-sdk/blob/master/examples/example.php>
require_once('facebookphp/src/facebook.php');

$app_id = "xxxxx";
$app_secret = "xxxxxx";

// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
  'appId'  => $app_id,
  'secret' => $app_secret,
  'fileUpload' => true,
));

// Get User ID
$user = $facebook->getUser();
var_dump($user); 
if ($user) {
  try {
    $page_id = 'xxxx';
    $album_id = 'xxxxx';
    $page_info = $facebook->api("/$page_id?fields=access_token");
    if( !empty($page_info['access_token']) ) {
        $args = array(
            'access_token'  => $page_info['access_token'],
            'scheduled_publish_time' => "1361642425", #an example timestamp
            'message'       => "test post",
            'source'        => "@" . "/path/to/photo.jpg",
            'published' => "0",

        );
        $post_id = $facebook->api("/$album_id/photos","post",$args);
        #echo $post_id;
    } else {
        $permissions = $facebook->api("/me/permissions");
        if( !array_key_exists('publish_stream', $permissions['data'][0]) ||
            !array_key_exists('manage_pages', $permissions['data'][0])) {
            // We don't have one of the permissions
            // Alert the admin or ask for the permission!
            header( "Location: " . $facebook->getLoginUrl(array("scope" => "publish_stream, manage_pages")) );
        }

    }
  } catch (FacebookApiException $e) {
    var_dump($e);
    $user = null;
  }
}

// Login or logout url will be needed depending on current user state.
if ($user) {
  $logoutUrl = $facebook->getLogoutUrl();
  echo '<a href="'.$logoutUrl.'">logout</a>';
} else {
  $loginUrl = $facebook->getLoginUrl(array('scope'=>'manage_pages,publish_stream'));
  echo '<a href="'.$loginUrl.'">login</a>';
}

// ... rest of your code
?>

This code sends the photo to my facebook page planned in the future, fine, except when the program runs out of time, the photo is not published. In the activity log, the photo remains in the "scheduled messages" section with the error "Sorry, something went wrong while publishing this scheduled post"

I suspected that this was due to the parameter: "published" => "0",

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