Re: Integrating cookies between bbpress 0.9.0.4 and wp 2.7.1
I also was stuck on that for a while. I found it easier to downgrade WP 2.7 cookies with this plugin:
Just make sure you juse just the old SECRET_KEY in wp-config.php and match it to the BB_SECRET_KEY in bb-config.php
Clear your domain cookies after activating the plugin and login again. Test login/out on both installations.
Of course you mast have completed the integration steps described here: