Hello Chiara,
I have no precise remark but you are indeed not the first one having
problems with "Nan" velocities : see
http://www.mail-archive.com/yade-dev@lists.launchpad.net/msg04519.html
and
http://www.mail-archive.com/yade-dev@lists.launchpad.net/msg04766.html
(at least).
Jerome
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