Index: openacs-4/packages/acs-kernel/sql/postgresql/upgrade/upgrade-5.9.1d5-5.9.1d6.sql
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-kernel/sql/postgresql/upgrade/upgrade-5.9.1d5-5.9.1d6.sql,v
diff -u -N
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ openacs-4/packages/acs-kernel/sql/postgresql/upgrade/upgrade-5.9.1d5-5.9.1d6.sql	24 Jun 2016 15:44:37 -0000	1.1.2.1
@@ -0,0 +1,35 @@
+--
+-- Since many years, new installations are created with "Registered
+-- Users" (object_id -2) having object_type as "application_group" and
+-- the context id of the main subsite (see
+-- acs-kernel/sql/postgresql/acs-install.sql).
+--
+-- However, it seems as if some prior upgrade scripts have not cared
+-- sufficiently to update all installation correctly (some have still
+-- "group", some have no context_id set). This upgrade script tries to
+-- bring everything in sync such that "newer" and "older"
+-- installations behave the same.
+--
+DO $$
+DECLARE
+  v_main_subsite_id acs_objects.object_id%TYPE;
+BEGIN
+	select object_id from site_nodes
+	into v_main_subsite_id
+	where parent_id is NULL order by node_id limit 1;
+
+	update acs_objects 
+	       set context_id = v_main_subsite_id
+  	       where object_id = -2
+	       and context_id is NULL;
+
+        update acs_objects
+	       set object_type = 'application_group'
+	       where object_id = -2
+	       and object_type = 'group';
+
+	update acs_objects
+	       set title = '#acs-kernel.Registered_Users#'
+	       where object_id = -2;
+END$$;
+