[Trent Adams]

Take a look at this thread:

https://bbpress.org/forums/topic/185?replies=6

Then, if that doesn’t help, maybe check out this thread:

https://bbpress.org/forums/topic/462?replies=4#post-2607

That first thread is about key masters getting downgraded to administrators and the second thread is about getting a user upgraded to key master through the database and the bb_usermeta or wp_usermeta depending on if you are integrated with WordPress or not.

Trent