I have about half a dozen ads showing across my various sites that appear to be broken - they look like this screenshot I took this morning:
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and here:
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It's not happening with *every* ad, and they seem to be happening with the same half dozen advertisers as well, and there are plenty of text ads that do render correctly; it's like they're using the AdWords ad builder and goofing it up somehow. I double checked to make sure my margins were okay and I wasn't trying to shove a 300px wide ad into 290px or something similar, but like I say - I get lots of good text and image ads.
I can't see how this type of thing serves Google, the advertiser or the publisher. But AdSense is not interested in hearing about it - they punt it over to AdWords, and I've reported it to them several times and never heard back.
How about fixing the existing platform before adding a mess of new complications? I've been seeing these for at least a couple months now.