Error We apologize for the inconvenience, but we are unable to process your request at this time. Our engineers have been notified of this problem and will work to resolve it.
I got that message too. It happens to me occasionally. It usually starts working again shortly. I have noticed that my adsense account has been rather slow just navigating lately too.
mostly, they will let you know if their website get maintance,.... if you using adsense there's a daily check that google employee to that....