The following bug has been logged online:
Bug reference: 1964
Logged by: Kevin Walker
Email address: kwalker@ameritrade.com
PostgreSQL version: 8.1 beta 3
Operating system: Windows XP
Description: Role membership error
Details:
I created a group role called dbadmin and assigned it the privileges that I
wanted. I then created a new login role and attempted to add this new login
as a member in the group role. The following error is generated in pgAdmin
III and when the same steps are performed manually.
ERROR: role "dbadmin" is a member of role "kw"
The message suggests that the login role "kw" is already a member of group
role "dbadmin" which is not the case. Using the alter group command also
produces the same error.
This problem is occurring on the build for Windows. I have not tested this
process on a Linux build yet.