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Hello Lei--

> As it turned out, without using the cart_cool, the anneal.py works
> fine.? Thanks for the help and please let me know when you find the
> difference between 2.18 and the later version. I have several
> simulations done using the older version.

It turns out the the reason for the crash was the 0 value used for the
final temperature for simulated annealing. The variable timestep
algorithm in the IVM chokes with T=0. In the next release the IVM will
exit when given this combination of parameters. 

Note that the original version of anneal.py did not have finalTemp=0.

best regards--
Charles
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