Can't register an account, same thing happens. Enter all my details, click Create account button, page refreshes, all my info is gone, no error message.
Are all forms broken on jqueryui.it at the moment? Also got lots of PHP errors about not being able to parse the URL. Obviously couldn't tell them about it because it's broken... Catch 22.
Even signing up to jQuery forum took a couple of attempts before it was error-free.