Hi everybody, As I (and others) already mentioned in this mailing list, there is a python crash (like an exit) when we use scipy under windows for a simple operation like : from scipy import * a = zeros(300000,typecode='F') c=a*a Analyzing the scipy source code, it seems to come from the fastumath module : I comment every line that import fastumath and it works !!! Is anyone have an idea to solve this problem with fastumath under windows ? Thanks. O.R.