Index: branches/RC/core/install/upgrades.sql
===================================================================
diff -u -r9639 -r9659
--- branches/RC/core/install/upgrades.sql	(.../upgrades.sql)	(revision 9639)
+++ branches/RC/core/install/upgrades.sql	(.../upgrades.sql)	(revision 9659)
@@ -121,8 +121,8 @@
 ALTER TABLE PortalUser
 	CHANGE FirstName FirstName VARCHAR(255) NOT NULL DEFAULT '',
 	CHANGE LastName LastName VARCHAR(255) NOT NULL DEFAULT '';
-	
-# ===== v 4.2.1 =====	
+
+# ===== v 4.2.1 =====
 INSERT INTO ConfigurationAdmin VALUES ('UseSmallHeader', 'la_Text_Website', 'la_config_UseSmallHeader', 'checkbox', '', '', 10.21, 0, 0);
 INSERT INTO ConfigurationValues VALUES (DEFAULT, 'UseSmallHeader', '0', 'In-Portal', 'in-portal:configure_general');
 
@@ -136,6 +136,8 @@
 	ADD AdminInterfaceLang TINYINT UNSIGNED NOT NULL AFTER PrimaryLang,
 	ADD Priority INT NOT NULL AFTER AdminInterfaceLang;
 
+UPDATE Language SET AdminInterfaceLang = 1 WHERE PrimaryLang = 1;
+
 DELETE FROM PersistantSessionData WHERE VariableName = 'lang_columns_.';
 ALTER TABLE SessionData CHANGE VariableValue VariableValue longtext NOT NULL;