Problem with fpi in NONMEM 7.3

Dear NM users, I've been encountering a problem when using NONMEM 7.3 and the file passing interface for parallel computing. The run I'm trying to get going consists of 5 problems within a single NONMEM run. Here is a short extract of the script: $PROBLEM Fit cohort 1 $INPUT ... $DATA data.csv IGNORE=@ IGNORE(COHORT.EQ.1) REWIND ... $ESTIMATION ... MSFO=run1.msf --- $PROBLEM Post hoc predictions $INPUT ... $DATA data.csv IGNORE=@ IGNORE(COHORT.NE.1) REWIND $MSFI run1.msf ... $ESTIMATION ... MAX=0 --- $PROBLEM Fit cohort 2 $INPUT ... $DATA data.csv IGNORE=@ IGNORE(COHORT.EQ.2) REWIND ... $ESTIMATION ... MSFO=run1.msf --- $PROBLEM Post hoc predictions $INPUT ... $DATA data.csv IGNORE=@ IGNORE(COHORT.NE.2) REWIND $MSFI run1.msf ... $ESTIMATION ... MAX=0 --- $PROBLEM Fit all data $INPUT ... $DATA data.csv IGNORE=@ REWIND ... $ESTIMATION ... The script works perfectly fine without the parallel computing option. When using the fpi I get the following error message: At line 169 of file <unit = 26, file = ´FILE26´> Fortran runtime error: End of File The run consistently fails when initiating problem 5 (i.e. the initial OFV evaluation). I've searched the NONMEM guides, and tried looking for some information online on gfortran but I was not able to identify the problem. Hopefully someone on this forum can shed some light on this behavior. Warm regards, Pieter Colin Department of Anesthesiology University Medical Center Groningen