[@chrishajer Participant 15 years, 9 months ago]

Are you using the default theme? If not, try the default theme and see if you have the same error. Someone else posted this recently and I can’t recall what it turned out to be. Here are a couple relevant posts:

https://bbpress.org/forums/topic/can-not-post-new-topic-in-this-forum#post-25509

https://bbpress.org/forums/topic/bbpress-error-closed-topic#post-22226

https://bbpress.org/forums/topic/problems-with-forum-is-category-in-10-alpha-6#post-25526

Also, why are you using alpha 4? I thought the basic integration screencast used alpha 6 and WordPress 2.7. There may be some bugs that were fixed between alpha 4 and alpha 6.