Hi, I've diagnosed a bit more a bug I briefly mentioned a while ago; here's what happens: I have the following minimal example script: <script> open denmark outfile --write &quot;(a)userdir/optionerrortest.py&quot; print " tracestats = -teff * log(1-evals).cumsum()" outfile --close </script> I'm expecting a file optionerrortest.py with the contents: <expected> tracestats = -teff * log(1-evals).cumsum() </expected> but I effectively get the following contents: <actual> ? print " tracestats = -teff * log(1-evals).cumsum()" Invalid option '-e' Fehler bei Skriptausführung: Stopp </actual> It actually seems to be a newly introduced behavior, because the test script 'py4gretl_test.inp' that you (Allin) had requested in May fails for the same reason, where it ran fine back in May. (It clearly was a good idea of you to ask for that test scenario.) /sven