Index: branches/RC/core/install/install_toolkit.php
===================================================================
diff -u -N -r11711 -r11760
--- branches/RC/core/install/install_toolkit.php	(.../install_toolkit.php)	(revision 11711)
+++ branches/RC/core/install/install_toolkit.php	(.../install_toolkit.php)	(revision 11760)
@@ -559,7 +559,7 @@
 
 			$category_fields = Array (
 				$fields['name'] => $name, 'Filename' => $name, 'AutomaticFilename' => 1,
-				$fields['description'] => $description, 'Status' => $status,
+				$fields['description'] => $description, 'Status' => $status, 'Priority' => -9999,
 			);
 
 			$category_fields['ParentId'] = $this->Application->findModule('Name', 'Core', 'RootCat');
@@ -582,6 +582,13 @@
 			// ensure, that newly created category has proper value in Priority field
 			$priority_helper->recalculatePriorities($event, 'ParentId = ' . $category_fields['ParentId']);
 
+			// update Priority field in object, becase "CategoriesItem::Update" method will be called
+			// from "kInstallToolkit::setModuleItemTemplate" and otherwise will set 0 to Priority field
+			$sql = 'SELECT Priority
+					FROM ' . $category->TableName . '
+					WHERE ' . $category->IDField . ' = ' . $category->GetID();
+			$category->SetDBField('Priority', $this->Conn->GetOne($sql));
+
 			return $category;
 		}