I just finshed a brief run of Poser 5 without a single problem. I well admit that problems may show up as I get deeper into the program, this first test had none. Unlike my adventures trying to run Poser 5 on a late model Dell. Baa Humbug Bill Gates. Dual 800 Mhz Quicksilver, 1.5 Gig of Ram, and Jaguar 10.2.6. I can't wait (next year I Hope) to try it on a G5.