Oh, I forgot that even Google needs some engineering and maintenance from time to time. I was wondering why the page didn't load trying to check my today's performance.
I tried to login, with the correct password and email, and gave me the red word "service temporary unavailable" as I were typed the wrong password. That's shocked me! Then I checked my email, no email from adsense support... This thread explain it all .. thanks
Looks like it's back up now...I checked my stats. Who knows whether it'll be stable or not right now though.