Put the title in CDATA tags.
Try this. Untested
You can't have a & in there. It has to be encoded or in cdata.
PHP Code:
<?php
// ####################### SET PHP ENVIRONMENT ###########################
error_reporting(E_ALL & ~E_NOTICE);
// #################### DEFINE IMPORTANT CONSTANTS #######################
define('SESSION_BYPASS', 1);
define('LOCATION_BYPASS', 1);
define('DIE_QUIETLY', 1);
define('THIS_SCRIPT', 'external');
// ################### PRE-CACHE TEMPLATES AND DATA ######################
// get special phrase groups
$phrasegroups = array();
// get special data templates from the datastore
$specialtemplates = array();
// pre-cache templates used by all actions
$globaltemplates = array();
// pre-cache templates used by specific actions
$actiontemplates = array();
// ######################### REQUIRE BACK-END ############################
define('DIR', dirname(dirname(__FILE__))); //how many dirname calls depends on location of file.
chdir(DIR);
require_once DIR . '/global.php';
// #######################################################################
// ######################## START MAIN SCRIPT ############################
// #######################################################################
$threads = $db->query_read("select * from " . TABLE_PREFIX . "site_news ");
header('Content-Type: text/xml');
header('Expires: ' . gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
$output = '<?xml version="1.0" encoding="' . $stylevar['charset'] . '"?>' . "\r\n";
$output .= "<rss version=\"2.0\">\r\n";
$output .= "<channel>\r\n";
$output .= "<title>RSS Feeds From Sim 2 World</title>\r\n";
$output .= "<link>" . $vbulletin->options['homeurl'] . "</link>\r\n";
$output .= "<description><![CDATA[" . htmlspecialchars_uni($vbulletin->options['description']) . "]]></description>\r\n";
$output .= "<language>" . $stylevar['languagecode'] . "</language>\r\n";
$output .= "<pubDate>" . gmdate('D, d M Y H:i:s', TIMENOW) . " GMT</pubDate>\r\n";
$output .= "<generator>Sim 2 World</generator>\r\n";
$output .= "<ttl>60</ttl>\r\n";
while ($thread = $db->fetch_array($threads))
{
$output .= "<item>\r\n";
$output .= "<title><![CDATA[". $thread['newstitle'] . "]]></title>\r\n";
$output .= "<link>" . $vbulletin->options['homeurl'] . "?news_id=" . $thread['newsid'] . "</link>\r\n";
$output .= "<pubDate>" . $thread['date'] . " </pubDate>\r\n";
$output .= "<description><![CDATA[". $thread['newsartcle'] ."]]></description>\r\n";
$output .= "<author><![CDATA[(" . $thread['newsauthor'] . ")]]></author>\r\n";
$output .= "<guid isPermaLink=\"false\">" . $vbulletin->options['homeurl'] . "?news_id=" . $thread['newsid'] . "</guid>\r\n";
$output .= "</item>\r\n";
}
$output .= "</channel>\r\n";
$output .= "</rss>";
echo $output;
?>