The problem was with a change made to the show_ads.js file that is downloaded for every AdSense ad unit view. The problem was first reported on August 11th, but it took until August 15th for the problem to be resolved. More details on the specifics of the problem at JenSense.
Twitter Canada MD Kirstine Stewart to Keynote Toronto
ClickZ Live Toronto (May 14-16) is a new event addressing the rapidly changing landscape that digital marketers face. The agenda focuses on customer engagement and attaining maximum ROI through online marketing efforts across paid, owned & earned media. Register now and save!