edinburgher - 6:22 am on Jun 6, 2012 (gmt 0)
The multi-dimensional tweaks of the past year has shaken the system into continuous instability & oscillations.
I reckon that's a good diagnosis. Each individual tweak probably makes sense in isolation but they interact in unpredictable ways. Adsense today is chaos theory in action.
A well known example of this is the double pendulum. Adsense has many, many pendulums... and our earnings are at the end of the last one.
There are examples of the effect on Youtube, here's a good one I found. Mods please delete link if not allowed: