It does work on OSX in Classic mode, but if I remember correctly Curious Labs say they don't support it. I bought Jaguar a couple of days ago, and Poser seems to work better with that than with OSX 10.1.5 which I had before. For example, with OSX 10.1.5 if I quit Poser I had to restart Classic to be able to restart Poser, but with Jaguar it's not necessary. Classic mode also starts much faster with Jaguar.