I shunned an artifact in the wiki and clicked on the rebuild button and the refreshed page didn't render properly in my browser. Here's the start of the page output to the browser (excluding the 'quote' pseudo-tags, of course):
<quote>
 (0%)...
HTTP/1.0 200 OK
Date: Wed, 17 Feb 2010 19:49:24 GMT
Connection: close
Cache-control: no-cache, no-store
Content-Type: text/html; charset=utf-8
Content-Length: 3823
</quote>