512MB, and only things like processor temperature monitor and IR link in background. Alt-tab shows nothing else running. And it's a 1.4GHz Athlon machine so at least I don't have to wait long to see that it's failed. The file is definitely a valid obj file because it shows up fine in XDSoft's 3D Exploration file viewer. Anybody want to volunteer to look at the file if I e-mail it to you? Zipped of course.