Hi Justin, Yup, the grompp works fine. :) Gotta figure out on the Blowing Up now. (>.<) Thank you once again! Take care. -- View this message in context: http://gromacs.5086.x6.nabble.com/genion-tp5007916p5007924.html Sent from the GROMACS Users Forum mailing list archive at Nabble.com.