It feels like almost every other day where I see threads on the issue of Google not reporting AdSense clicks properly.
A new thread at WebmasterWorld has dozens of publishers complaining that their reports seem to have stalled or are seriously lagged. There are also a few threads at DigitalPoint Forums and Google AdSense Help.
My first thoughts are to just stop checking hourly and check back tomorrow. But for someone who earns 75% of their income with AdSense, I can understand why the concern.
Forum discussion at WebmasterWorld.