I registered and was logged in. Closed the browser, came back, can't find a way to log in. I'm in as the WelcomeGuest user, and can't seem to change that.
Also, while in as the WelcomeGuest user, I was able to change the properties of my user account to make it read-only. Odd, but I guess it works out OK considering how everything else works. (Well, it would be OK if I could log in as myself.)