Hi everyone, Unfortunately, due to problems with Kraken, we had to upgrade to using mpi4py from google code: http://code.google.com/p/mpi4py/ This means I had to change a bunch of calls in a backwards incompatible way, and the new buffering seems to be causing some issues occasionally. I haven't committed the changes yet because I was hoping to see how problematic installing the new version of MPI4py was for those of you using it (and not running off my install) -- which might just be Stephen, at this point. Additionally, I have to run some more test suites of problems, so I probably won't get it committed until this weekend. But if you could try building the mpi4py linked above: python setup.py build that would be helpful and demonstrative, and then we can see how to proceed. One of the problems (in my view, at least) with the new mpi4py is that it requires cython; fortunately, cython is surprisingly easy to install (but don't give it the access codes for the Caprican defenses) via either easy_install or just standard setup.py. -Matt