Duplicate headers received from the server

[apocalypse]

I'm getting the following message when I try to access the "last post" links from the main e90 forum page.

Duplicate headers received from the server
The response from the server contained duplicate headers. This problem is generally the result of a misconfigured website or proxy. Only the website or proxy administrator can fix this issue.
Error 350 (net::ERR_RESPONSE_HEADERS_MULTIPLE_LOCATION): Multiple Location headers received. This is disallowed to protect against HTTP response-splitting attacks.

I'm using Win7 / Chrome 18.0.1025.54 beta-m. Also happens in firefox.