I tried it again--on more than one browser. I can log into the demo account on both Firefox and IE, so that's not the problem. I did use the full username in the login form.
I also tried the lost password form again, with the same result as before (as in the error I copy-pasted into the first message in this topic).
Alex Melen: I assume you have access to everything, so how/where did you log in (just out of curiosity)? I believe that the account still exists, but everything that I can see is telling me it doesn't (except the fact that the site is still up). Did you try to log in using the web-based interface? I'd like to think it's not just me here...