It looks like the value of the MCA param mpi_param_check was flipped from true to false in r28236, the recent MCA param update.
Nathan -- did you mean to flip this value? It means that we're running without MPI API param checking by default, which is a change from all prior versions of Open MPI.
Changing the default back is as simple as deleting line 84 in ompi/runtime/ompi_mpi_params.c.
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