> so an existing forum with 1000 users will have to instruct every single one to clear their cookies
Not necessarily, it just may be an issue if your cookies weren’t expired already.
> I wonder if this has to do with the hard coded hash I have set in bb-config.php
> How does this affect a setup with a shared login from wordpress where you have to match the same hash it has?
You will need to also run WordPress trunk to match the cookies and hash methods up. WordPress has also migrated their cookies and password hashes in trunk.
> hope there was a good reason to fiddle with it
Judge for yourself, we followed WordPress’ lead: