Please keep in mind that the auction house button may be grayed-out for some players immediately following maintenance. This is intended, and is only temporary. For more information, visit: http://us.battle.net/d3/en/forum/topic/6036616686#1
Update 9:10 a.m. PDT: Game maintenance has concluded and patch 1.0.3b is now live.
The gold and real-money auction house are still undergoing maintenance at this time, and we will provide an update once the service is available again.
We will be performing scheduled maintenance for Diablo III starting tomorrow (7/10) at 5:00 a.m. PDT in order to deploy patch 1.0.3b. We anticipate that maintenance will conclude and that all services will be available by approximately 10:00 a.m. PDT.
Important: Please note that you will not be prompted to download patch 1.0.3b until the patch is live in your home region. If you are logging in from a European or Asian client, you will need to wait for this patch to release in that region before it can be installed. Additionally, if your home region is the Americas, you will be unable to log into Europe or Asia using Global Play after patch 1.0.3b is live until those regions have also patched.
For reference, here are the scheduled maintenance times for each region:
The Americas: 5:00 a.m. PDT to 10:00 a.m. PDT
Asia: 1:00 p.m. PDT to 5:00 p.m. PDT
Europe: 8:00 p.m. PDT to 12:00 a.m. PDT
Please note that these times are estimated and subject to change. For time zone assistance, please visit: http://everytimezone.com