Nuri A Temiz wrote:
Dear Mark

The mdp file is how it should be. I also did a cut-off run from the same starting point and it runs. For the PME i have tried to decrase the time step to 1 fs. that did not work either. The protein is exploding and simulations is crashing.

OK. Take your cutoff and PME .tpr files and compare them. The simplest thing to do is to "gmxdump -s cutoff.tpr > cutoff.txt" and similarly for PME. Then use diff to compare them. This will make absolutely clear whether you are doing the same thing with different electrostatic treatment or not. Also visualize the exploding and non-exploding runs to see if that enlightens you.

Mark
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