Index: branches/5.3.x/core/install/upgrades.sql
===================================================================
diff -u -N -r15916 -r15917
--- branches/5.3.x/core/install/upgrades.sql	(.../upgrades.sql)	(revision 15916)
+++ branches/5.3.x/core/install/upgrades.sql	(.../upgrades.sql)	(revision 15917)
@@ -2946,3 +2946,5 @@
 WHERE Phrase = 'la_title_SystemToolsDeploy';
 
 INSERT INTO SystemSettings VALUES(DEFAULT, 'EmailDelivery', '2', 'In-Portal', 'in-portal:configure_advanced', 'la_section_SettingsMailling', 'la_config_EmailDelivery', 'radio', NULL, '1=la_opt_EmailDeliveryQueue||2=la_opt_EmailDeliveryImmediate', 50.11, 0, 1, NULL);
+
+DELETE FROM UserPersistentSessionData WHERE VariableName = 'email-queue[Default]columns_.';