I believe all versions of MB3D since v1.7.5 have been created equal as far as being able to run on MAC, I think v1.7.5 was the first v where Jesse made a concerted effort to make it as MAC ready as he could. Jesse is the sole programmer of MB3D, it's his baby and is only available at FractalForums. As of this time it is only 32 bit with no forseeable 64 bit version coming due to limittions of the Language being used and Compiler limitations, all versions are designed for Windows PC but usable on MAC under WINE.

I just recently checked Buddhi's(Krzysztof Marczak) site and Mandelbulber has 32/64 bit versions for PC, Linux and MAC

 http://www.mandelbulber.com/download.php

Remember...No matter where you go there you are