Re: Can’t add additional tags to post
It seems to be a user thing. I’d been posting from a user that’d been established in WordPress. I updated it to Key Master in bbPress, so it should have all powers. But I found that, apart from tags, I couldn’t delete a post either, same no permission message (same as noted by Jolaedana above). So I logged out and logged in as Superadmin, the default account from bbPress installation, and voila, I can do everything, add tags, delete posts.
That doesn’t solve the problem. I haven’t tested to see what happens with other users, both already registered from WP and registered through bbPress. But it’s a workaround for me, and a…clue.