viral - 6:20 am on Sep 24, 2012 (gmt 0)
As an update to my earlier post. My Rpm has come back now that the ads have been in place a few weeks!
Nothing else has changed!
This seems to tell me either
a)Google deliberately made my rpm bad until I made the changes they wanted me to!
b) or more likely one of the big advertisers in my niche moved from 120x600 ads to 160x600 ads and Google was trying to hint that I should follow their lead. Anyway money flowing much better now so I am happy.
Hope this helps!