Dear Nat, I changed the .py file as you suggested, and for the moment, it seems to work. Thanks! Cheers, Uli --------------------------------------------------------------------------- dr ulrich gohlke staff scientist - macromolecular structure and interaction max-delbrück-center for molecular medicine (mdc) +49 30 9406 - 2725 (w) +49 30 9406 - 2548 (fax) [email protected] mailto:[email protected] http://www.mdc-berlin.de/en/research/research_teams/macromolecular_structure... http://www.mdc-berlin.de/en/research/research_teams/macromolecular_structure...