I am running OS10.3 on 1gb G4 with 1024mb RAM and no problems. Vue D'Esprit 4 arrived yesterday and wouldn't install. Went to Vue D'Esprit site to download patches for Panther and for Vue D'Esprit 4.2. (They wouldn't download in Safari and had to download in Explorer). Downloaded patches o.k. but they were useless once on the desktop unstuffed. Ran fix permissions and put Vue D'Esprit back in the cardboard shipping box.