Confusion with RegisterForm and after_signup

[wjurkowlaniec]

Hello!
I have problems, and couldn't find help anywhere:
I do like in docs with extending profile: http://thesoftwarestudio.com/apex/extending_profile.html

But I have integrityerror when I try to flush the session - new object which should go to auth_users is not there yet and it doesn't allow me to save my profile.

Any hints?

Thanks in advance