--- filter.module	2008-12-04 21:51:00.000000000 -0600
+++ filter_fixed.module	2008-12-04 16:55:00.000000000 -0600
@@ -766,6 +766,9 @@ function _filter_htmlcorrector($text) {
     $single_use = drupal_map_assoc(array('base', 'meta', 'link', 'hr', 'br', 'param', 'img', 'area', 'input', 'col', 'frame'));
   }
 
+  // Remove the teaser separator before entifying angle brackets.
+  $text = str_replace('<!--break-->', '', $text);
+
   // Properly entify angles.
   $text = preg_replace('!<([^a-zA-Z/])!', '&lt;\1', $text);