jpch - 5:47 pm on Jan 29, 2013 (gmt 0)

For what's it worth I got the largest debit I've ever seen for Invalid Traffic as well yesterday, January 28th...but I don't use CloudFlare. Used to use CF but stopped when upgraded to a better Host. Anyway, it could be related or maybe not, could just be that AdSense decided to issue debits on 1/28 and they were larger than usual.