Vray C4D transparent materials not showing in viewport on Mac OSX??

Hi All

I've trying to solve this for two days now with no luck.
Basically no transparent texures will show in the viewport when using Vray for C4D on Mac OSX.
The materials show up fine in the material editor and when I render the scene, but just not in the viewport.
The transparent materials themselves show as black in the viewport.
I have display set as Gouraud Shading.
Here's what Ive tried

Reinstalled Vray
Tried both Vray 1.8.1 Nov release and 1.26D in C4D R15 & R14 both updated
Tried both iMac 2009 (mavericks) and MacbookPro (10.8.5) currently using
In Options I have selected Linear workflow shading, Enhanced OplenGl, Transpanecy,tags, normals and textures.
Detail is set at medium (but have tried all)
I'm using vray lights and cameras
In vray options under materials
I have transparency set at 50 levels, glossy effects, refraction/reflection, maps and filter maps are all selected
tried selecting and deselecting use approx. OGL preview for Materials (256x256).
Tried both downloaded scenes and scenes i've built from scratch.

Ive also attached screenshots, showing the viewport and the rendered scene.

Any help will be greatly received, Thanks in advance for any help

Cheers
AdamB