Hi Thanks Greg for your answer. Yes, my simulation is in fact pretty long and its files are considerably large. The size of the xtc files is approximately ~2 GB when I am trying to do the restart. I thought on the contrary that my problem was related to another post in today's list ( http://lists.gromacs.org/pipermail/gmx-users/2010-September/053701.html). My xtc files were not synchronized (by very little). The answer to that other message was that in case the xtc files were not synchronized one would have to create new and synchronized tpr files using tpbconv and the trr files with positions and velocities. Can anyone confirm this? Thanks
David
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