[Paul Wong-Gibbs]

Had you ever previously installed BuddyPress or attempted a BuddyPress forum installation on this site / database before now?

Are all the forums broken, or do, for example, newly-created groups’ forums work ok?

Is your WordPress set up as a multisite? (this used to be called WPMU. If you don’t understand this question, the answer’s no)

Are the bbPress tables in your database? For example, wp_bb_forums, wp_bb_meta, wp_bb_posts and so on?