StarCraft® II

Players can see "BREAKING NEWS" on the left centre of your screen when accessing the game

A Battle.net Authenticator can represent an excellent way to add an additional layer of security to your Battle.net account. We appreciate that our players make use of their authenticators, and to help make them more convenient, we’ve introduced the authenticator by-pass. Those of you that have World of Warcraft accounts may already be familiar with how it works: when you log into a Blizzard game from the same location, you won’t always be prompted for an authentication code until you attempt to log in from a different location.

The authenticator bypass is active for StarCraft II, and is enabled by default. Those of you who wish to disable this feature can do so by opting out of the bypass on your Battle.net account management page. If you opt out of the by-pass, you will be prompted by Battle.net for an authentication code each time you log in.

If it still asks you every time when you log in on the website,
Check your account management page, there is an option to switch it back to asking you every time - perhaps it was accidentally turned on