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Is this some special technology Google has put in to prevent fraudulent clicks? I can click on the ads just fine on another page of my site....
I noticed this happened after I put in some Amazon associate ads on the same page - surely Google isn't regarding this as a competitor, is it?
ps - the ads themselves do change on each page refresh...
And is not likely related to Amazon ads.
Maybe you should remove the code and replace it to make sure the code is accurate.
If that doesn't help, I'd email the AdSense folks and let them know about the problem.
P.S. Uh, I wouldn't mention that you've been clicking on the ads. And I suggest that you stop the clicking. I've heard that can get you booted out of the program pretty quick.
I had Doubleclick ad on a page on the top above my navigation bar. The ad that appeared once was an interstitial rich media kind of animated ad which one generally sees on ABOUT.com (those damn moving ads ;)
The ad though only 468*60 prevented me from clicking on any of the links on the top header. To debug it, I tried to select that entire top area using my mouse, and I saw a huge marked area (something like a huge transparent image) after I selected the entire top area with the mouse.
My guess is that the banner messed it up, took over ownership of its surrounding pixel ;), & prevented the navigation links to work.
Same thing could be happening with your page. I am sure its not anything to do with Google Adsense. Since your skyscraper works, I presume your 468 banner didn't work. Perhaps you have some banner code at top of your page or some script.
I had a DIV with a transparent image stretched to 100% going right over the Google ads! So it was covering the ad, and of course the links became unworkable...! Doh.
Google actually did reply in the end, and said 'thanks for bringing this to our attention, we're investigating it.'!