Howdy!
I just setup a fresh copy of the z3ext buildout and created a principal for myself with all of the access I could see to give. I set the password initially, and after failing to login, went back as Manager and used the password reset form, which has confirmation.
I can't login as this principal, and don't seem to get a password reset mail, either.
I'm happy to help track down and solve these problems, just hoping to create discussion!