The Fluid Mud communication is very sensitive for temporary files not being deleted. Clean up the run directory as much as possible before starting a simulation. Linux: To switch OFF Shared Memory usage: - In file "run_flow2d3d_flm.sh": useSharedMem=0 - In file "dioconfig.ini": Replace "StreamType=SharedMem" by "StreamType=ASCII" in Dataset 1 to 8 Linux: Be sure to clean up all resources: - Check that all executables are stopped (using the command "ps" or "qstat") - Check that all shared memory blocks are freed (using the commands "ipcs" and "ipcrm" Adri.Mourits@deltares.nl 28 March 2011