Oh I just discovered something unrelated but very bad.
Your templates have a web virus in them, at least the bbpress side.
Go look in header.php front-page.php and probably others.
You'll see something like this in them:
<script language="javascript">document.write('<style> #a1dd122 { margin: -40000px; position: absolute; text-align:right; } </style>');
</script><a href="">..... 20mg</a>
You probably got the template from one of the fake sites that has been infected (or someone copied them from there onto another site).
Always search for document.write and eval in templates. They should never appear.