What was the last time when you saw your Google Adsense earnings go exactly zero? I am not talking about your earning for today so far, but Google Adsense users today complaining that all they Estimated earnings reset to zero.
Just today at 19-July almost all Google Adsense users complaining that their earnings suddenly showing Zero earnings so far in all classes such as Today so far, Yesterday, This month so far and Last month. This is one of the very rarest & unusual activity by Google.
There might be latency or maintenance in the Google system, and hopefully everything will return to normal within 24 hrs probably less.