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:

Adsense were being displayed on it and I got around 35 clicks. Now today Adsense is not displaying ads on this page

Here is another post from a senior member:

There have been a couple of threads lately where someone mentioned ads were not appearing on their site(s). Just a blank space was there - no PSA's, nothing.

I've noticed it myself a couple of times and on pages that have had good targeted ads for years. One minute the ads aren't there - return to the page a few minutes later and they're back.

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:

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