Dupin v1.4.2 Released
A small number of Dupin users reported getting a crash at startup with v1.4.1, so this has been fixed in the latest release. The issue was caused by either 1) a playlist selected in Dupin's Playlist Popup no longer existed or 2) an iTunes update would re-create a default Smart Playlist (such as "90's Music") which had been selected in the Playlist Popup. Neither condition should be an issue now.