The following bug has been logged on the website:
Bug reference: 7825
Logged by: Randy Boudwin
Email address: rboudwin(at)automatedlogic(dot)com
PostgreSQL version: 9.2.2
Operating system: Win 7 64
Description:
When I attempt to uncheck the superuser permission on a user I created
pgAdmin throws up a confirmation window. Regardless of whether I select Yes
or No, it still closes the dialog and rechecks the superuser permission.