Thank you very much @urbanjost ! The NAMELIST trick seems to be a robust way of read in from a file! Will investigate it!
By the way,
Like what kind of debug statements? Thanks!
It seems when in MPI, the read is slightly different from without mpi.
I checked the line ending like some CR|LF stuff, and it looks fine,
Perhaps when in MPI, the read from rank 0 has a line length limit or format restriction or something?