Matt, I agree that it must be something related to the project file, and in particular to the data file (I have both the data file and the feff calculated paths in the project, as well as the fit): if I ask the program to plot any path, Aquaterm opens... If I run the fit again, I get the following message in the echo buffer: Error finding data and/or FEFF files: Artemis could not find the following files: Data: /Users/stefano/.horae/stash/artemis.project.0/chi_data/ni_lyo_athena.chi so....something happened to the data file while saving the whole project. I have seen this behavior quite a few times. COuld it be related to the zipping process??? Stefano -- ____________________________________________ Stefano Ciurli Professor of Chemistry Department of Agro-Environmental Science and Technology University of Bologna Viale Giuseppe Fanin, 40 I-40127 Bologna Italy Phone: +39-051-209-6204 Fax: +39-051-209-6203 "Fatti non foste a viver come bruti, ma per seguir virtute e canoscenza" Dante Alighieri - Inferno - Canto XXVI "Ihr seid bestimmt, nicht Tieren gleich zu leben, Nein, Tugend zu erringen und Erkenntnis" "Ye were not form'd to live the life of brutes, But virtue to pursue and knowledge high"