Please be aware that there will be site maintenance this Saturday, May 17th, from 10 am - 2 pm PDT . The start time is 6pm (Saturday) in London, 10.30pm (Saturday) in New Delhi, and 3am (Sunday) in Sydney.
You will not be able to access your account during the maintenance, but your ad serving and reporting will not be affected.
I still wonder why the Adsense page never gives out these updates. There's a light green TIP box on the Adsense page...that could easily be converted to the UPDATE box if there's anything worth mentioning.