I am now running the development version on my WP site. When I upgraded to the development veriosn I noticed a coincidental drop in adsense revenue. Some of my adsense units were served up by the Datafeedr plugin. I just changed it to serve the ads directly now to see what happens.
I may just be conincidental, but I want to check if anyone thinks it's possible that somehow this ad serving plugin might not be compatible with W3 Total Cache (or any caching system for that matter) and screwing up adsense?