I'm getting the same thing. There's something screwed up at the server. Clicking on the Register button takes you to a page that's headed with this error message:
ErrorException [ Notice ]: Memcache::get(): Server 127.0.0.7 (tcp 11211) failed with: Connection refused (111)
ErrorException [ Notice ]: Memcache::get(): Server 127.0.0.7 (tcp 11211) failed with: Connection refused (111)