graeme_p - 8:23 am on Apr 1, 2011 (gmt 0)
@ember, yes I made several change. The problem is that I do not know which change was necessary.
The likeliest explanation was that they thought the navigation was confusing, as HuskyPup suggested. I am quite happy to have made those changes because it has also made the site small device friendly which I needed to do anyway.
It could also be the removal of "related pages" links, which pushed up the ratio of links to pages on small pages a lot.
Google could easily cover the cost of giving people (except tiny sites) better answers by reducing our share of revenues by about 1%.
I would love to know if I can re-introduce the related pages links at a different location (at the bottom of the page, instead of on the side below the navigation).
If I can find another network that pays comparably Adsense will go out and the related page links will come back in!