Today AND yesterday actually. It says I have had 79 clicks today, and obviously I've payed for 79 clicks. My AdSense though tells me I have only had 18 pageviews on this site. Or does it mean some asshole has been clicking my ads a billion times? Is there a way to check IP or something of clickers?
I often have that difference between Adsense / Adwords but is much lower (few percents). AdLogger (http://www.adlogger.org/) is an open-source PPC click tracking and click fraud prevention program but i think that is against AdSense TOS to collect info about visitors. Maybe I'm wrong anyway...
Adsense updates a LOT slower than adwords. Wait until the end of the day before you start purchasing click fraud detection software.
Two days in a row it happened... I sent them an e-mail and they just told me to trust them, blah blah bullshit. I removed my adwords and haven't had them up since. They're not gonna ruin me for nothing.