If I load a python source file using python-mode.el, and then subsequently look at a .org file using org-mode.el, I get an error: 

Lisp error: (wrong-type-argument stringp nil)

and then I cannot see my .org file (nothing is displayed in the buffer).  

Specifically the steps to reproduce are:

1) run 'emacs --no-site-file --no-init-file'

2) eval "(require 'python-mode)" to load python-mode.el

3) find-file "some/python/file.py"

4) find-file "some/org/file.org"

and I get the above error.  If any of the above steps are omitted (ie, if I load python-mode.el, but don't actually look at a python file), I don't get the error.  I've included a traceback below.  I'm also submitting this to as a bug to org-mode (https://bugs.launchpad.net/python-mode/+bug/1108910).  I've never had problems with org-mode in this vein before, and this started immediately after starting to use python-mode.el, so I suspect that the problem lies there.  However, the whole traceback seems to be in org-mode code, so I'm sending this to you, as well.

I'm running:

OS X 10.7.5

Emacs 24.2.1

org-mode 7.8.11

python-mode 6.1.0

Backtrace attached.

Thanks, 

Greg