Re: Cookies not shared between 0.9 and 2.5
OK, so it looks like you have matched the domains and paths correctly. Have you matched the bbPress “BB_SECRET_KEY” in bb-config.php to the WordPress “SECRET_KEY” in wp-config.php?
Do the secrets stored in each database match?
In bbPress it is the “secret” meta_key for topic “0” in bb_topicmeta.
In WordPress it is the “secret” meta_key in the wp_options table.
(Keep in mind that the cookie contents aren’t meant to be the same as they are hashed against the login time.)