First I had a problems with login, but I fixed that by updating jsmf to 2.0.2.1.

Now everything works perfectly except when I disable forum wrapping.
When forum is wrapped into the site and I login, it logs me without problems.
BUT When I disable wrapping option, and go to login from the site, it redirects me to SMF and login is done there, but I'm unable to login in Joomla site with this option disabled. I don't want my forum to be wrapped into the site, so can I avoid this problem somehow? Also before you ask, yes, I have disabled option "Redirect to Forum on login" and my login module is "Joomla-SMF"