I am trying to run a simple system (before I setup up a more complex system) which consists of several polymers ~50 monomers each in a spherical confinement. I am using the PSAW to place the polymers. but then when I go to heat up the system by placing a cap on the LJ potentials the program stops. Just freezes and I have to cntr-c. some other strange observations if I change epsilon sometimes is will get to the second warm step and then freeze. Thirdly all my Lennard Jones potentials in my observable file show negative energy, is this a convention?? Thanks, Nick