I visited your webpost and it appears to be working ok, is this something that only happens in the admin panel?
Type opening admin/tpl_admin_menu.php and find:
PHP Code:
<a href="../groups.php">Groups</a>: <? getgroupcount() ?><br>
change to:
PHP Code:
<a href="../groups.php">Groups</a>: <? // getgroupcount() ?><br>
You will not see the group count in your admin stats, but this will help narrow down the problem.