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I am not necessarily seeing the offending ad since I cannot see what my visitors are seeing
Also remember, there are end of month "adjustments". They have been known to unexpectedly rain upon some earlier unexpected day's results.
Just to set the record straight, I've experienced virtually every negative thing anyone has posted about Adsense at one time or another (but not in some of the extremes reported here) and I don't think I'm somehow immune to worse things happening. Having said that, when 90% of earnings are taken away in an end of month adjustment, something outside the norm is taking place and to just lay the entire blame on Google without exposing the publisher side of the equation leave one with no conclusion to draw. Because I've never experienced a 90% adjustment doesn't mean it can't happen to me but on the flip side, it does make me wonder if there's more to the story than meets the eye. Is it really just about G not wanting larger publishers to experience success or is there a completely valid reason for such drastic action. It's a phenomenon that is surrounded in mystery and Google isn't the only party responsible for that mystery IMHO.