Just happened while I was in the game, I have never had parental controls on the account and only one Diablo 3.....dont know what the issue could be.
Same problem. I'm located in Australia (Blizzard just reported connectivity issues in the north/east region of NA; but it's more widespread?)
same issue here, located in Spain :S since this morning. I can log in the forums, in my account by here, but not with the battenet page/ app
The previous issue appears to be resolved now, however; we're doing some quick maintenance at the moment that may have an impact on logins to the games and websites. We'll continue to update as more information becomes available.