diff -r 649dc51c26b6 Lib/idlelib/EditorWindow.py
--- a/Lib/idlelib/EditorWindow.py	Fri Oct 14 10:31:44 2011 -0500
+++ b/Lib/idlelib/EditorWindow.py	Mon Nov 28 13:46:01 2011 -0600
@@ -269,9 +269,6 @@
                     self.good_load = True
                     is_py_src = self.ispythonsource(filename)
                     self.set_indentation_params(is_py_src)
-                    if is_py_src:
-                        self.color = color = self.ColorDelegator()
-                        per.insertfilter(color)
             else:
                 io.set_filename(filename)
         self.ResetColorizer()