Rails - Sep 2009 - sessions are disabled with "config.cache_classes =true"

Hi.

I found that sessions are disabled and can''t login with
restful_authentication.

Session and login works fine with "config.cache_classes = false" but
it doesn''t work with "config.cache_classes = true".
It doesn''t show any errors, but redirect to login page.
It seems to be post nothing.

Does it have to do with session_storre, active_record_store,
protect_from_forgery, or other configrations?

my enviroments is Rails 2.2.2 Ruby 1.8.6

Any ideas?