As you suspected, I've installed openmpi using macports, and this 
might be the source of the problem. Here I send you the result of 'otool 
-L' for the mpi4py and PyTrilinos libraries.

otool -L 
/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mpi4py/MPI.so
 


/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mpi4py/MPI.so:
     /opt/local/lib/libmpi.1.dylib (compatibility version 2.0.0, current 
version 2.7.0)
     /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current 
version 169.3.0)

otool -L 
/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyTrilinos/_Epetra.so
 

/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyTrilinos/_Epetra.so:
                 .
                 .
                 .
     /opt/local/lib/libstdc++.6.dylib (compatibility version 7.0.0, 
current version 7.17.0)
     /opt/local/lib/gcc45/libgomp.1.dylib (compatibility version 2.0.0, 
current version 2.0.0)
     /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current 
version 1669.0.0)
     /opt/local/lib/gcc45/libgcc_s.1.dylib (compatibility version 1.0.0, 
current version 1.0.0)

One possible solution would be to use homebrew instead of macports 
(which I see you do), and I've been tempted to do it, but I've read that 
installing MayaVi using homebrew is sort of a nightmare. Where you able 
to install MayaVi in your system using homebrew?

Adrian.
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