NOTE FOR BASH USERS: I run modeller and it crashes with this message: "/bin/mod6v2: line 38: 1874 Segmentation fault (core dumped) $NICE ${EXECUTABLE} $STEERF >$LOGF" I used bash and I put the following command line in the .bashrc file as suggested in some messages of the mailing list: ulimit -S unlimited It appears that using the -s (lower case "s") solved the problem mentioned above. -S means Soft limitation and -s for stack maximum. The correct command is therefor: ulimit -s unlimited