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.
The Original Search Marketing Event is Back!
SES Denver (Oct 16) offers an intense day of learning all the critical aspects of search engine optimization (SEO) and paid search advertising (PPC). The mission of SES remains the same as it did from the start - to help you master being found on search engines. Register today!