Hello there, I have exactly the same problem: since the installation of the new version the minifig wizard gives an 'this program has performed an illegal operation' error (22 years ago, 12-May-03, to lugnet.cad.leocad)
(...) I forgot to post here but I found and fixed the problem, just download 0.73.2 and it will work. Leonardo (22 years ago, 14-May-03, to lugnet.cad.leocad)