Hello,
I've:

Joomla 1.0.15
SMF 1.1.4
Joomla-SMF 2.0.2.1a
mod_smf_login 2.0.3

I've followed step-by-step the user guide, but I have this problem:
when I try to login using the SMF Login Module, I'm redirected in the SMF login form with all the fields already set but with error "invalid password". If I press the login button in the SMF login form all work fine!
Any idea?