I have had similar problems when I used ‘Wishlist Member’. Basically I had added custom post types into this and had configured it for all – forums, topics and replies. Then when it was changed to only control ‘Forums’ (custom post i.e. removed Topics and Replies), it worked fine. Thats an immediate solution.
Basically its a permission issue.
Also do one thing. Deactivate all other plugins except bbPress. Now activate them one at a time and you will know the culprit (using a browser, say Firefox). It takes a few seconds when you reload the forums page logged in as a subscriber/user from another browser (say Edge).
The steps have been outlined at this link and it works perfectly.
Shortcode to add “Edit Profile” link
