There are two WebmasterWorld threads and some Google Groups threads reporting that some AdSense ads sporadically are disappearing.

Several publishers are reporting that a new ad they placed on a particular page received impressions and clicks on day one and then on day two, the ad received no impressions and when the publisher checked out the page, he/she was shocked to see the ad missing. Here is one publisher’s story:

Here is another post from a senior member:

Over the course of a few days, a bunch of these types of threads have been popping up. I’m going to place a new ad below this line and you guys let me know if you see it or not:

I guess keep checking back over the course of the next few hours and let me know. It does seem very out of the ordinary for an AdSense ad not to render. Maybe Google is having ad server issues or maybe it is something else?

Forum discussion at WebmasterWorld and Google Groups.

Confirmed: The ads are disappearing, even my test ad above. Here is a screen shot, I even tried refreshing 5 times, very rarely does the ad show up: