Hi Bruno and Wolfgang I finally fixed it! If there is anyone who has the same problem as I described: replacing MPICH with open-mpi resolves this issue. I do not know why, but this method has fixed two macs for me: I have never installed open-mpi before so there were no conflicting between MPICH and open-mpi. I still think something is wrong among dealii, mpich and mac OS 10.13.
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