It appears that I may have this issue. I am trying to set up bbPress for the first time and am being told that I do not have permission to set up a new forum.
My temp site that I am roughing in is m.sqrft.net I have a theory that is related to this thread. This site was copied from http://www.sqrft.net where it had a plugin called “Admin username changer”. One of the first things that I did after the copy was deleted that plugin. When I got this error message and read this thread, my first thought was that maybe deleting it wasn’t enough. Perhaps there was still some embedded something in there someplace. I reinstalled the plugin then used it to change my admin password to admin again then deactivated the plugin.