Hello Erik,
I notice that GRHydro_LastMoLPostStep.c accesses MoL::MoL_Intermediate_Step, which is not yet defined during initial data setup. In this case, should InLastMoLPostStep be set to 0 or to 1?
It should be set to 1 whenever one is not in the MoL RHS (that is the assumption currently in GRHydro which is the only user of this functionality).
Yours, Roland