Python pip issue

[Adam Dershowitz Ph.D., P.E.]

I am trying to install a package, and have run into a problem.  
I did make sure that I am running the correct python:
I have pip-2.6 installed, and I have used port select to make sure that macport python26 is active.  If I then do:
sudo pip-2.6  install PyJSBSim I get progress and then I see:
Successfully installed PyJSBSim

If I do:  pip-2.6 freeze, then I see it present:  
	PyJSBSim==0.5.5

But if I then try to use it, from within python, it doesn't seem to be present.  In python I get this:
from PyJSBSim import FGFDMExec
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named PyJSBSim

But, if I look in:
/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages
I see these:  
PyJSBSim-0.5.5-py2.6.egg-info
pyjsbsim

I know that this worked for me a couple of months back with 10.6, but I recently upgrade to 10.8 and now it just doesn't seem to show up.  Any suggestions?  Does 10.8 handle search paths any differently?  I did do a full fresh install of all ports.  

So the bottom line is that the port of pip-2.6 thinks it is installing something, but the selected python then doesn't actually see it.

--Adam