For the past several months, Google has had an issue with reporting on pageviews for the second ad unit on a page. The issue has become more noticeable now that the AdSense beta is in the hands of all publishers.

A WebmasterWorld thread brought this old issue to light for me. The publisher explained “only the first ad unit on a page triggers a page view. Thus, if you have two ad units on a single page (header and footer) and look at channel stats for the second ad unit, it will report zero (or nearly zero) PAGE impressions while the ad unit impressions, clicks, etc. are correct.”

This can be deceiving for some publishers.

Google AdSense representative, Engineer Guillaume, replied to the issue in detail saying in a Google AdSense Help thread:

Forum discussion at WebmasterWorld & Google AdSense Help.