Recently our web server provider decided to shut down on short notice. That forced us to migrate the website to a new server. Most is up and running, but if you run into any issues, please report them (ideally in the issue tracker, or on the mailing list responsibility-devel@lists.sourceforge.net).
Some people have had problems with signing up, since no activation email is being sent. If that happens to you, please send an email to the mailing list from the mail address that you've used to register, tell us the situation and include the username. This way we can activate the new account manually. Hopefully we'll be able to solve this soon enough though!