Works like a charm on my system, too -- OS X 10.2.6, dual monitors, 1.25 gig ram, yadda yadda yadda. Backdrop is great, now all that's really needed is to be able to have each of the ortho-views have their own backdrop. Or at least have Left-Right, Top-bottom and Front-back have their own b-d. But, good feature in any case.