Oh, if it asks for your password than it's because that email is already registered. If password recovery is not working in this case, the it's definitely a bug. I'll look into it, but meanwhile can you maybe use another email address to signup?
I'm also unable to register with my email (then it says "welcome back" and asks for a password) or recover my password (says that my email address is not registered).
When trying to use FB login I get "Whoops! We could not log you in using Facebook. Please try signing up using your email".