I bought early 350d in Dec 2005, and my only Mac in '07 with 10.4 software. That 10.4 software also worked smooth with my 2007 450d
Dec 22, 2010 I bought 10.6 Box set w/ new iLife and (iWorks?). I couldn't get just the $29 upgrade to 10.6, because that product was written for, and I had not up graded to 10.5
That's when I started having downloading problems w/ the older 350d. Took Mac in for unrelated service Nov '11, and long story short, came home w/ 10.7 installed, no 10.7 dvd for reinstall, and gave up my $129 10.6 box set for a $136.74 gift card
Still thinking about going back to 10.4, as I have tried downloading current drivers from canon.usa, tried new USB cables, rebooted, etc - all seem to work a few times. Sometimes it seems like a timing conflict between to different Utility programs written for 2 diff cameras
just saw that 2.7.2 update - glad to hear I may want the earliest Version if possible