Index: branches/RC/core/install/install_toolkit.php
===================================================================
diff -u -r11610 -r11623
--- branches/RC/core/install/install_toolkit.php	(.../install_toolkit.php)	(revision 11610)
+++ branches/RC/core/install/install_toolkit.php	(.../install_toolkit.php)	(revision 11623)
@@ -573,6 +573,14 @@
 
 			$category->Create();
 
+			$priority_helper =& $this->Application->recallObject('PriorityHelper');
+			/* @var $priority_helper kPriorityHelper */
+
+			$event = new kEvent('c:OnListBuild');
+
+			// ensure, that newly created category has proper value in Priority field
+			$priority_helper->recalculatePriorities($event, 'ParentId = ' . $category_fields['ParentId']);
+
 			return $category;
 		}