Google's AdSenseAdvisor posted a thread at WebmasterWorld notifying AdSense publishers that there will be a reporting delay and we should not panic.
Normally, when the reports lag, you see hundreds of posts in the various forums with publishers panicking. It is no surprise some people worry, because some people are fully dependent on the income they make from Google through AdSense.
AdSenseAdvisor said yesterday at about 2pm (EST):
Just writing to confirm that you may be seeing a temporary delay in the reporting of clicks that started this morning (June 9). We're still recording clicks and your stats will catch up. Ad targeting and ad serving are not affected. While this is well within the "no need to panic" window of reporting time, I wanted to give you a heads up in case you see impressions registering normally but a lower-than-usual number of clicks showing up in your reports.
I'm sorry if this has caused you any stress.
Hopefully the reports are now up to speed.
Forum discussion at WebmasterWorld.