I am using a snapshot build of Emacs: emacs-trunk-r112044-20130314-w32-i386.zip, which says it is GNU Emacs 24.3.50.1 (i386-mingw-nt6.1.7601) of 2013-03-14 on VBOX
on Windows 7/64.

My python-mode comes from the python.el shipped with the above emacs, which says it is Version: 0.24.2.

Org-mode is from git trunk: 
 commit 3842b073c332256ebfeecb0b01f859bb720cb68f
 Author: Bastien Guerry <bzg@altern.org>
 Date:   Mon Mar 18 20:36:46 2013 +0100



On Wed, Mar 20, 2013 at 10:08 AM, Nick Dokos <nicholas.dokos@hp.com> wrote:
Ista Zahn <istazahn@gmail.com> wrote:

> >
> > Did :session ever work? Then I might be wrong with this comment.
>
> Not only did it work, it currently works for me. I seem to remember
> bad interaction with python modes other than the one shipped with
> emacs. In my .emacs I have
>
> ...
>
> All the python-mode and ipython mode stuff is commented out partly
> because it did not play nice with org-mode. Using the default python
> mode works for me. So, for those of you who are finding that this is
> not working, what python mode are you using?
>

The one distributed with emacs 24.3.50 (at least afaict: I don't think
I'm doing twisted things but you never know :-) ).

Question for you: what version of org mode?

Nick





--
Gary