Archive from user: yujie liu This “gmx -do\_dssp” tool will report an error “Segmentation fault” and no xpm and xvg file generated. I tesetd 2.0.4 and later version of dss Then I checked gmx\_do\_dsscpp code and found some parts of matrix changed a alot, I think this code may have a problem. Hope developer can solve this issue. Thanks! *(from redmine: issue id 3444, created on 2020-03-16 by gmxdefault)* * Uploads: * [md.tpr](/uploads/dbacbd5fb2956aff2203d1611737d8de/md.tpr) * [md.xtc](/uploads/23eb69fdaef5db6a8a931114a8ea5ef4/md.xtc)