[Therion] metapost error on Windows7

[Xavier Pennec]

Since I installed the last version of therion, metapost is randomly 
bugging on writing temporary files with the message
"! I can't write on file `'. Please type another file name for input:"
As this is blocking therion, I have to kill the compilation windows and 
retry. It usually reworks after a few try.
I tried so see what was wrong in the tmp files with the compile option 
-d without success so far

Does anyone experience the same behavior or does it come from some 
special feature of my installation?

Xavier

-- 
> -------------------------
> Xavier Pennec
> Senior Research Scientist / Directeur de recherche
> Asclepios project-team, INRIA Sophia-Antipolis
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> F-06902 Sophia-Antipolis Cedex, France
> +33 4 92 38 76 64
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> http://www-sop.inria.fr/asclepios/
> -------------------------------