Hi Patrick, lab_sea & tutorial_tracer_adjsens are stopping with a seg-fault on faulks, in S/R mom_calc_visc. myThid is getting too big (I added a print, and got 2097568549 in lab_sea and 347563328 in tracer_adjsens) in line: act1 = bi - myBxLo(myThid) Curious that it seems to work on eddy. Jean-Michel