A thread at WebmasterWorld reports that many people cannot see or display the Yahoo! Publisher Network ads on their site. The reports came as early as August 31st saying that there ads are down.
Upon further investigation, it looks like yahoo is blocking our DNS name server from querying the ypn-js.overture.com IP address on their DNS server. If I use a different name server the ads show up.
I wanted to let you know that we have confirmed that certain ISPs have been intermittently unable to access the domain that serves Yahoo! ads on your site. We are currently working with the affected ISPs to fix this problem. Feel free to contact customer support if you are experiencing this issue.
We expect to resolve the issue shortly and appreciate your patience.
Hope they fix it soon. Also, Brett, can you change her name to YahooSarah? :)
Forum discussion at WebmasterWorld.