Index: template.php
===================================================================
--- template.php	(revision 96)
+++ template.php	(working copy)
@@ -35,7 +35,7 @@
  * Implements HOOK_theme().
  */
 function zen_theme(&$existing, $type, $theme, $path) {
-  include_once './' . drupal_get_path('theme', 'zen') . '/template.theme-registry.inc';
+  include_once dirname(__FILE__) . '/template.theme-registry.inc';
   return _zen_theme($existing, $type, $theme, $path);
 }
 
Index: theme-settings.php
===================================================================
--- theme-settings.php	(revision 96)
+++ theme-settings.php	(working copy)
@@ -2,7 +2,7 @@
 // $Id: theme-settings.php,v 1.6 2008/09/15 09:59:03 johnalbin Exp $
 
 // Include the definition of zen_theme_get_default_settings().
-include_once './' . drupal_get_path('theme', 'zen') . '/template.theme-registry.inc';
+include_once dirname(__FILE__) . '/template.theme-registry.inc';
 
 
 /**
Index: www/sites/all/themes/zen/zen/template.theme-registry.inc
===================================================================
--- template.theme-registry.inc	(revision 96)
+++ template.theme-registry.inc	(working copy)
@@ -47,7 +47,7 @@
 
   // Compute the conditional stylesheets.
   if (!module_exists('conditional_styles')) {
-    include_once './' . drupal_get_path('theme', 'zen') . '/template.conditional-styles.inc';
+    include_once dirname(__FILE__) . '/template.conditional-styles.inc';
     // _conditional_styles_theme() only needs to be run once.
     if ($theme == 'zen') {
       _conditional_styles_theme($existing, $type, $theme, $path);