Reply To: 404 error on forums after updating to v2.3
Hey Jason! You could try resetting the user roles, in: Tools > Forums
You can also try this neat little tool I wrote, to check out what capabilities specific users have in your forums: https://github.com/johnjamesjacoby/bbp-capabilities/
What you’re experiencing sounds like bbPress isn’t sure what to do with the role those users have, or doesn’t like the capabilities those users have saved in the DB. Other users have had similar issues, and have fixed them by remapping the roles with the above tool(s).