Index: branches/5.1.x/core/kernel/application.php
===================================================================
diff -u -N -r13905 -r13987
--- branches/5.1.x/core/kernel/application.php	(.../application.php)	(revision 13905)
+++ branches/5.1.x/core/kernel/application.php	(.../application.php)	(revision 13987)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: application.php 13905 2010-08-29 10:36:55Z alex $
+* @version	$Id: application.php 13987 2010-10-19 08:57:53Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -1039,7 +1039,7 @@
 			$perm_helper =& $this->recallObject('PermissionsHelper');
 			/* @var $perm_helper kPermissionsHelper */
 
-			if ($perm_helper->CheckUserPermission($user, 'CATEGORY.MODIFY', 0, $this->ModuleInfo['Core']['RootCat'])) {
+			if ($perm_helper->CheckUserPermission($user, 'CATEGORY.MODIFY', 0, $this->getBaseCategory())) {
 				// user can edit cms blocks
 				$editing_mode = $this->GetVar('editing_mode');
 				define('EDITING_MODE', $editing_mode ? $editing_mode : EDITING_MODE_BROWSE);
@@ -3232,4 +3232,18 @@
 		return false;
 	}
 
+	/**
+	 * Base category of all categories
+	 * Usually replaced category, with ID = 0 in category-related operations.
+	 *
+	 * @return int
+	 */
+	function getBaseCategory()
+	{
+		// same, what $this->findModule('Name', 'Core', 'RootCat') does
+		// don't cache while IS_INSTALL, because of kInstallToolkit::createModuleCategory and upgrade
+
+		return $this->ModuleInfo['Core']['RootCat'];
+	}
+
 }
\ No newline at end of file