Hi Craig, Which OpenMPI did you install? I thought OpenMPI comes with XCode, but since that doesn't have a Fortran compiler, do you have to get a different OpenMPI for the Intel compilers? We aren't currently running the parallel I/O tests on our Leopard platform, but it sounds like we should be to catch this sort of problem. Also we can only afford the Intel compilers for a Linux test platform currently. Maybe we can reproduce the problem there ... --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: UCS-450316 Department: Support netCDF Priority: Normal Status: Closed