I also had an error message (no account exist for this login, I though I was banned!) but now it seems back to normal.
Error We apologise 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. get that too from uk thought was just me
It's been working fine for me all day here (Canada) I log in and out about once an hour.. lol. (yes im a adsense junkie)