they'll need more info on yer render settings and in what manner d3d ffrender script doesn't work.  they may also wanna know which version of OS X and what machine, RAM, graphics card, poser prefs et al.  not seeing transmapped hair in there, but find all transparent surfaces and uncheck "visible in raytracing".  IC (AO and IDL) allows interpolation error into the lite calcs.  AOIC=100 or IDLIC=100 means interpolation error = 0.  this setting means render will be very slow.  it will likely cause PPC or low-ram intel macs to quit.

I reckon the render progress bar actually disappears and the render stops, rather than the render appearing to stop while the progress bar continues to move (may be a feature, not a bug), then you hit "cancel".