Re: BBpress setup through buddypress plugin?
Do you get an error message of any kind?
You can try disabling and reenabling the forum component. Login to the WP backend, navigate to “BuddyPress > Component setup”. Disable bbPress and save. Enable it again.
Also do the same thing with the BP group in question. Go to your group admin page, navigate to “Group settings”. Disable discussion forum and save. Then re-enable the discussion forum and save.
Try posting your forum topic now.