I went to this co op member's site today www dot onlinemarketingtoday dot com and saw this Partners: ad_network.php file needs updating | ad_network.php file needs updating | ad_network.php file needs updating | ad_network.php file needs updating | ad_network.php file needs updating This is a quality (PR7) site that has not updated. I notice when these links are click they take you to the DP join page. Do the sites that now require 'updating' appear in other coop sites?
Sites that need to be updated will display that on their site since they failed to update from the email notification. Their ads will also be out of the rotation because you cannot pass validation without displaying ads.
Its important to note that you have to replace your current ad_network_ads.txt file aswell. Although my site was revalidated, it was still showing the ad_network.php file needs updating ads until I replaced the txt file with an empty one.
Sorry to bump an old thread but there sure are a lot of sites showing this! http://www.google.co.uk/search?hl=en&q=ad_network.php+file+needs+updating
Obviously some people don't look at their own site very often because if I recall, the last mandatory update was about a year ago.