I use macs since 1988, currently the main is an imac 27 "(i7, 32GB RAM).
I say this because I preferred not use the MAC version of the Z-Suite but the Windows version through Parallels. It has worked flawlessly.
The same goes for other 3D programs I use: Rhinoceros and Moi3D.
I would not waste time trying to run the Mac version, it runs actually "emulated" by Mono Framework. I mean is not a truly Mac experience, is best to use the Win version.