My rectangle, skyscraper and leaderboard ads have stopped earning! For years they were the main earners, especially the 300x250 rectangle - but no more! Their income has declined more and more - now 80-90% of my income is from the link units only! Is there a problem with the reporting? Is Google trying to wean us off the big ads? Is there some smart-pricing at work? Whats going on? .S.
I'm not sure but, for some reason I've noticed that big ads are sometimes left as blank white areas on my blogs. Maybe that's part of it, but I'm not sure exactly what your situation is.