Index: CategoryTree/CategoryTreeFunctions.php
===================================================================
--- CategoryTree/CategoryTreeFunctions.php	(revision 63630)
+++ CategoryTree/CategoryTreeFunctions.php	(working copy)
@@ -307,11 +307,14 @@
 	* load CategoryTreeFunctions.php on demand.
 	*/
 	function ajax( $category, $depth = 1 ) {
-		global $wgDBname;
+		global $wgDBname, $wgUser;
 		$title = self::makeTitle( $category );
 
 		if ( ! $title ) return false; #TODO: error message?
 
+		# configkey needed to take into account variant and secure options.
+		$configkey = $wgUser->getPageRenderingHash();
+
 		# Retrieve page_touched for the category
 		$dbkey = $title->getDBkey();
 		$dbr = wfGetDB( DB_SLAVE );
@@ -321,7 +324,7 @@
 				'page_title' => $dbkey,
 			), __METHOD__ );
 
-		$mckey = "$wgDBname:categorytree(" . $this->getOptionsAsCacheKey( $depth ) . "):$dbkey"; 
+		$mckey = "$wgDBname:categorytree(" . $this->getOptionsAsCacheKey( $depth ) . "):$dbkey:$configkey";
 
 		$response = new AjaxResponse();