Hi, 

      When I run MD simulation with Forcite at NPT condition, I found, after 3 ns, the coordinates of atoms move more and more far away from the original box and then energy drop suddenly. Did anybody meet the same problem before? or is that a bug of the module? I choose Berendsen Thermoset and Berendsen Boraset, Version is MS 4.3. The trajectory file is too large and I put plots of density,energy,temperature vs time as attachments. Thanks a lot.