Very odd behavior. On my biggest earning site I am only at about 30% of my usual CTR but on other sites I am at my usual CTR. I wonder if some of the larger earning clicks are going through extra review before posting (hopefully but doubtful). Either that, or I just had very poorly matching ads showing today.
I just read through those posts on the Google Groups Adsense forum. WOW. Thanks for sharing the links. I hope Google's algorithm is accurate in determining fraudulent clicks. I would imagine that is one of the most difficult and yet most important aspects in keeping the program's value.
I think some of my advertisers must have woken up from their slumber on Tuesday, impressions, clicks and CTR were my new norm however EPC jumped by 143.5%...no specific country, just an across the board increase.
I never did get a click dump yesterday and very low clicks here again today. I had one "super click" earlier today but otherwise very little activity. Impressions look normal with pretty typical search terms.
Right now, things are borked but Google still keeps downloading about 350K pages of content a day on the main site. Real traffic is slow enough and it looks like something is seriously wrong with Adsense.
According to my reports from 6:30am (GMT) until 8am, I didn't get any clicks. I know there are quiet peaks and busy peaks, but I always get some clicks within an hour, so something isn't right here. Whether the estimate will change, or they'll be added onto today, I don't know, but I doubt it.