> I even added rds.yahoo.com as an "include" in the filter 
> list, but even that doesn't seem to do the trick.

If the redirect was detected *after* the original page was 
downloaded, httrack won't be able to "emulate" it - and it 
will prevent the script from working properly.

Note: I suppose you added the following in the filters 
(scan rules) section:
+rds.yahoo.com/someurl*