I had an issue with Adwords a few weeks back. They sent me notice that my adwords could not be served in frames and they nixed my ads. I had no idea what they were talking about, I use WP and no frames.
I simply said "prove it" and they got back to me saying they had fixed the issue and I was at no fault, but now this adsense "glitch" and seems like the same indications... Interesting.