I'm getting it aswell, only noticed it today. I was about to post the problem when I saw KMIELKE123 post. This is what it looks like:

Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /cgi-bin/html/ads/1264/10432/HP_proliantC1_336x280TRL.html.

Reason: Could not connect to remote machine: Connection refused



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Apache/1.3.12 Server at img.mediaplex.com Port 80

Also some of the links eg. profile, edit etc fail to fully load.