Usually if you delete the bb-config.php file, and then go to you main forum directory, it will go through the install process again and create you a new admin login without deleting the existing tables.
If you were using integration and hadn’t set up the correct user as keymaster, and your keymaster still exists, it is likely that you are looking at the wrong user tables. (wp_user vs bb_user)
If you are trying to integrate with buddypress / wpmu, then deleting the bb-config.php
and following the https://trac.buddypress.org/browser/trunk/bp-forums/installation-readme.txt
file will get you up and running with user sharing.
To do the integration you MUST be running the latest WPMU 2.7.1 branahc and BuddyPress trunk and NOTHING more that 1.0 Alpha 6 of bbPress – see here: https://buddypress.org/forums/topic.php?id=471
After that, you’ve got the usual cookie integration to do if you want to, see here:
http://umwblogs.org/wiki/index.php/Integrating_WPMu%2C_BuddyPress%2C_and_bbPress
Having been round this loop many times, I know how frustrating it can be.
Hope that helps.
