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.
Meet Your Favorite Search Engine Watch Contributors
Many of SEW's leading expert contributors will be at ClickZ Live, the new online and digital marketing event kicking off in New York (March 31-April 3). Hear from the likes of: Thom Craver, Josh Braaten, Lisa Barone, Simon Heseltine, Josh McCoy, Lisa Raehsler, Greg Jarboe, Dan Cristo, Joseph Kerschbaum, John Gagnon, Eric Enge and more!