BuddyPress.org

MartinNr5.

Clear your cookies, then after logging in both places, view your cookies in like Firefox. I am assuming that they should be named something like wordpress_ and wordpress_f5433ed3c296d4543 (where the letters after the underscore is a hash).

In both your wordpress and bbpress config files, add the following:

define('COOKIE_DOMAIN', '.example.org');

define('COOKIEPATH', '/');

define('COOKIEHASH', 'f5433ed3c296d4543');

Log out, clear cookies, and it should work.