_M_range_check error

Since pulling today, this happens:

Error{1}> *** Error:
Error{1}> *** in line 86 of file "RFQ_VECC-T.in":
Error{1}>      RUN,METHOD="PARALLEL-T",BEAM=BEAM1,FIELDSOLVER=FS1,DISTRIBUTION=DIST;
Error{1}>     vector::_M_range_check

Any insights anyone? @kraus, did you write something about distributions now being arrays? @adelmann?