[@chrishajer Participant 17 years, 1 month ago]

Did you use something like one of these two solutions to integration the cookies with the two versions you installed? The cookies are incompatible otherwise.

https://bbpress.org/plugins/topic/freshly-baked-cookies/

http://superann.com/2009/02/26/wordpress-26-27-bbpress-09-cookie-integration-plugin/