Could you try this and verify that it works?

@@ -32,7 +32,7 @@ an iterator returning such objects."""
     if frame_filter == None:
         frame_filter = constructor
     else:
-        frame_filter = lambda iterator: constructor (frame_filter (iterator))
+        frame_filter = lambda iterator, filter = frame_filter: constructor (filter (iterator))
 
 def create_frame_filter (iter):
     global frame_filter


Note also that we are going to rewrite this code.
It has some design flaws as-is.
We'll be sure to send a note to the Archer list when this gets underway.

I checked this in on archer-tromey-python.