Index: menu_helper.php
===================================================================
--- menu_helper.php	(revision 12877)
+++ menu_helper.php	(working copy)
@@ -215,9 +215,12 @@
 		 */
 		function _removeNonMenuItems($menu)
 		{
+			$theme_id = $this->Application->GetVar('m_theme');
+
 			foreach ($menu as $menu_index => $menu_item) {
 				// $menu_index is in "cN" format, where N is category id
-				if (!$menu_item['IsMenu']) {
+				if (!$menu_item['IsMenu'] || ($menu_item['ThemeId'] != $theme_id && $menu_item['ThemeId'] != 0)) {
+					// don't show sections, that are not from menu OR system templates from other themes
 					unset($menu[$menu_index]);
 				}
 			}
@@ -260,7 +263,7 @@
 						c.ParentPath AS ParentPath,
 						c.ParentId As ParentId,
 						\'cat\' AS ItemType,
-						c.IsMenu, c.IsSystem, c.UseExternalUrl, c.ExternalUrl, c.UseMenuIconUrl, c.MenuIconUrl
+						c.IsMenu, c.IsSystem, c.ThemeId, c.UseExternalUrl, c.ExternalUrl, c.UseMenuIconUrl, c.MenuIconUrl
 					FROM ' . TABLE_PREFIX . 'Category AS c
 					WHERE (c.Status = ' . STATUS_ACTIVE . ') AND (c.ParentId = ' . $parent['CategoryId'] . ')';
 			$items = array_merge($items, $this->Conn->Query($sql, 'ItemId'));