Index: branches/RC/core/install/upgrades.sql
===================================================================
diff -u -r9363 -r9398
--- branches/RC/core/install/upgrades.sql	(.../upgrades.sql)	(revision 9363)
+++ branches/RC/core/install/upgrades.sql	(.../upgrades.sql)	(revision 9398)
@@ -130,4 +130,6 @@
 
 ALTER TABLE Language
 	ADD AdminInterfaceLang TINYINT UNSIGNED NOT NULL AFTER PrimaryLang,
-	ADD Priority INT NOT NULL AFTER AdminInterfaceLang;
\ No newline at end of file
+	ADD Priority INT NOT NULL AFTER AdminInterfaceLang;
+
+DELETE FROM PersistantSessionData WHERE VariableName = 'lang_columns_.';
\ No newline at end of file
