Index: branches/5.2.x/index.php
===================================================================
diff -u -N -r16416 -r16417
--- branches/5.2.x/index.php	(.../index.php)	(revision 16416)
+++ branches/5.2.x/index.php	(.../index.php)	(revision 16417)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: index.php 16416 2016-11-13 21:24:09Z alex $
+* @version	$Id: index.php 16417 2016-11-13 21:29:34Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
Index: branches/5.2.x/core/units/configuration/configuration_event_handler.php
===================================================================
diff -u -N -r16415 -r16417
--- branches/5.2.x/core/units/configuration/configuration_event_handler.php	(.../configuration_event_handler.php)	(revision 16415)
+++ branches/5.2.x/core/units/configuration/configuration_event_handler.php	(.../configuration_event_handler.php)	(revision 16417)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: configuration_event_handler.php 16415 2016-11-13 20:59:35Z alex $
+* @version	$Id: configuration_event_handler.php 16417 2016-11-13 21:29:34Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -304,6 +304,14 @@
 
 				// update value in cache, so other code (during this script run) would use new value
 				$this->Application->SetConfigValue($variable_name, $object->GetDBField('VariableValue'), true);
+
+				$sorting_prefix = $this->getSortingPrefix($variable_name);
+
+				if ( $sorting_prefix ) {
+					$sql = 'DELETE FROM ' . TABLE_PREFIX . 'UserPersistentSessionData
+							WHERE VariableName LIKE "' . $sorting_prefix . '%Sortings.%"';
+					$this->Conn->Query($sql);
+				}
 			}
 
 			if ( $variable_name == 'Require_AdminSSL' || $variable_name == 'AdminSSL_URL' ) {
@@ -323,6 +331,35 @@
 		}
 
 		/**
+		 * Returns prefix, related to given sorting system setting
+		 *
+		 * @param string $system_setting System setting.
+		 *
+		 * @return boolean|string
+		 */
+		protected function getSortingPrefix($system_setting)
+		{
+			foreach ( $this->Application->ModuleInfo as $module_info ) {
+				if ( $module_info['Name'] == 'In-Portal' ) {
+					continue;
+				}
+
+				$prefix = ($module_info['Var'] == 'adm') ? 'c' : $module_info['Var'];
+				$config_mapping = $this->Application->getUnitOption($prefix, 'ConfigMapping');
+
+				if ( (isset($config_mapping['DefaultSorting1Field'])
+					&& $system_setting == $config_mapping['DefaultSorting1Field'])
+					|| (isset($config_mapping['DefaultSorting2Field'])
+					&& $system_setting == $config_mapping['DefaultSorting2Field'])
+				) {
+					return $prefix;
+				}
+			}
+
+			return false;
+		}
+
+		/**
 		 * Updates kDBItem
 		 *
 		 * @param kEvent $event