Need Help with Energy Minimization in Swiss-Pdb Viewer

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The FFM
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Need Help with Energy Minimization in Swiss-Pdb Viewer

I am using Swiss-Pdb Viewer v4.0.1 to look at a PDB of a dimeric membrane protein
I have mutated all the residues in 1 of the transmembrane spanning helices of each protomer to match that of a homologue.
I am now trying to run the energy minimizations, but the program just crashes each time I start the process. I have adjusted most of the minimization prefernces without it fixing the problem.  I am a windows XP user (if that makes a difference)
I need help as the manual is not good with troubleshooting advice.
thanks.