June 14, 2012
We just heard that posts from unregistered users are failing. We’re looking into it and we’ll extend answer deadlines if need be.
In the meantime, till we get the issue fixed, the quickest way to post would be to create an account for yourself.
[update - 15 Jun, 1620 PST]
The issue is fixed now. Please do let us know at firstname.lastname@example.org if you continue to see any problems.