Yes, they seem to have resolved the issue that resulted in the error:
500 Server closed connection without sending any data back
every time you tried to create a new user account on the Tabula Rasa Beta.
Still, I had an odd time getting logged in. You get access to the board by logging in with your PlayNC account. You are then asked to enter a forum name and password. But when it comes time to actually log into the forums, you use your PlayNC account name, but the forum password.
That seemed a bit odd, or at least counter-intuitive to me.
I would expect to either log into the forums with a separate account, as Turbine requires with Lord of the Rings Online, or log in with my PlayNC account and just have a forum name that was different from my login name, as it is done on the SOE forums. Instead, there was a third, mixed path.
Still, I figured it out and I am in.