Hello, I am trying to run dynamic process mangement using MPI4PY. For first studies I used on Windows XP (dont laugh:-) : - MPICH 1.4.1-p 32bit - Mingw Gnu Fortran compiler with link libary libfmpich2g.a - python 2.6 with MPI4PY - test cases 1 : mandelbrot-master.py + mandelbrot-worker.f90 (I had to replace "use mpi" with "mpif.h".) - test case 2 : master.py + pi.py I can run both testcases without errors or warnings, but the processes hang. If I interupt, the following output is given. (Note: test without dynamic process mangement work well.) I first assumed, that there is a problem with spawning/releasing the processes from MPI4PY. But then Mr. Dalcin advised me to write a fortran master for test case 1. I did this and noticed the same behaviour. Therefore it is obviously a problem with MPICH2-installation. Is this a known problem? If yes, is there a solution? Thank you very much in advance. Karl