Next to your character's name you should see a down-arrow. Click on that to display a variety of characters from any of the games you have associated with your Battle.net account.
1 Perky Pug
85 Pug Shaman
At the bottom of the list you should see an option to Manage Characters, click on that to expand the list of your in-game characters and accounts. At the very top (for most folks) you should see your BattleTag name without the associated hash and unique identifier numbers. That's the appropriate Diablo III character to select which can be verified after selection by the Diablo avatar next to your name. Click on that lone name that has no level or tag (#) number associated with it and you should be good to go!
We're keeping an eye on things but hope this will resolve any posting errors the majority of folks have contacted us about.
*If you have yet to create a BattleTag, visit Battle.net account management to set up your nickname today. Choose wisely, as it will (eventually) be your nickname that identifies you across all Blizzard games.
EDIT: Follow the blue Blizz button for more ... or go here: http://us.battle.net/d3/en/forum/topic/5150758673?page=5#93