privilege inheritance to a login role through a group role

Hello Everyone.
I am having issues with privilege inheritance to a login role through a group role.

These are the steps I am performing:

1. data: stcities belongs to user gdb, it resides in the gdb schema
2. map user is a login role:
CREATE ROLE map LOGIN
ENCRYPTED PASSWORD 'md59ec9dda576db2a36c42c1c3af155d07c'
NOSUPERUSER NOINHERIT CREATEDB NOCREATEROLE;

1. editor role is created, and privileges to the data are granted to it:
CREATE ROLE editor NOSUPERUSER INHERIT NOCREATEDB NOCREATEROLE;
GRANT select on gdb.stcities TO editor;

1. user map is made a member of the editor role:
GRANT editor TO map;

Now, theoretically, I am expecting the map role to be able to inherit the select privileges via the editor group role to the gdb.stcities data.

But that is not the case, when I make a connection to pgAdminIII as the map user, I receive the following message:

An error has occurred:
Error: permission denied for relation stcities

So, map is not inheriting the privs from the role.

-editor group has privs on the data: gdb=arwdxt/gdb,editor=r/gdb
-Selecting from pg_auth_members tells me that role map is part of group editor

So, why is map not inheriting the privs granted to the editor role? Am I missing a step?

Thanks in advance,
Sincerely,
Kasia