Index: includes/bootstrap.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/bootstrap.inc,v
retrieving revision 1.289
diff -u -p -r1.289 bootstrap.inc
--- includes/bootstrap.inc	14 Jul 2009 10:22:15 -0000	1.289
+++ includes/bootstrap.inc	18 Jul 2009 00:32:57 -0000
@@ -1028,7 +1028,7 @@ function drupal_unpack($obj, $field = 'd
  * Internet Explorer 6.
  */
 function check_plain($text) {
-  return drupal_validate_utf8($text) ? htmlspecialchars($text, ENT_QUOTES) : '';
+  return (preg_match('/^./us', $text) == 1) ? htmlspecialchars($text, ENT_QUOTES) : '';
 }
 
 /**