[BlueOnyx:04718] Only admin can add or remove users

[Todd]

Have a BO installation, working well except: Neither the users that are 
designated as "Site Administrator" for a particular domain, nor the "Server 
Administrator" can add or remove users from any domain.  (Users can be 
modified, but not added or removed.)  When attempting to add a user, clicking 
the save button results in an error message that says "Permission for CREATE 
is denied."   Any ideas or advice would be much appreciated.