Index: wp-admin/includes/theme.php
===================================================================
--- wp-admin/includes/theme.php	(revision 20728)
+++ wp-admin/includes/theme.php	(working copy)
@@ -124,7 +124,7 @@
 
 	if ( isset($themes_update->response[ $stylesheet ]) ) {
 		$update = $themes_update->response[ $stylesheet ];
-		$theme_name = $theme->get('Name');
+		$theme_name = $theme->display('Name');
 		$details_url = add_query_arg(array('TB_iframe' => 'true', 'width' => 1024, 'height' => 800), $update['url']); //Theme browser inside WP? replace this, Also, theme preview JS will override this on the available list.
 		$update_url = wp_nonce_url('update.php?action=upgrade-theme&theme=' . urlencode($stylesheet), 'upgrade-theme_' . $stylesheet);
 		$update_onclick = 'onclick="if ( confirm(\'' . esc_js( __("Updating this theme will lose any customizations you have made. 'Cancel' to stop, 'OK' to update.") ) . '\') ) {return true;}return false;"';