This is a bit embarrassing, but it appears that the OpenID button that allows you to log in with a WordPress.com username is not working. I'm not sure if this is on SE's end or on WordPress.com's end, but it will cause problems.
Remember, there was a significant amount of tension between the existing WP community and the WPA community when we first pitched the idea. I don't want this to be seen, even subconsciously, as a further disconnect between WordPress.com and WordPress Answers.
What can we do to address the problem as quickly as possible?
For the record, this was pointed out to me by another developer via Twitter this morning. I immediately logged out of WPA and tried to log back in via WordPress.com but received an error:
Unable to log in with your OpenID provider: No OpenID endpoint found.
I verified that http://ericmann.wordpress.com does exist. And this is the appropriate way to use WordPress.com's OpenID system according to their FAQ. I hate to ask, but could they be blocking OpenID requests from SE?