[NTLDR]

Change:

PHP Code:

$threadtitle=$DB_site->fetch_array($DB_site->query("SELECT * FROM thread WHERE forumid='$forumid' AND lastposter='$getchildforum[lastposter]' AND lastpost='$getchildforum[lastpost]'")); 


To:

PHP Code:

$threadtitle=$DB_site->fetch_array($DB_site->query("SELECT * FROM thread WHERE forumid='$forumid' AND lastposter='".addslashes(htmlspecialchars($getchildforum[lastposter]))."' AND lastpost='$getchildforum[lastpost]'")); 


That should fix the problem.