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ZMT material loads into ZMaterials folder LIGHTBOX but can not be seen in LIGHTBOX

.ZMT material loads into ZMaterials folder LIGHTBOX but can not be seen in LIGHTBOX
I restart ZBrush, still nothing in lightbox
I can use the material on a model
load it from the desktop and save it to ZMaterials
It can be seen in the ZMaterials folder through the Macs file system (Finder)

So anyone got any ideas HOW to use Lightbox for this king of storage?

Do you have any non ZMT files in the folder? That can sometimes stop Lightbox from loading anything in a folder, as I found out when I added some Brushes into my Insert Brushes folder.

There are no other files apart from 2 that came with the installation.
the Mac system might well have some invisible files.
the material did come from a PC system that was loaded into the model and then saved to the lightbox folder.
the material seems to show fine on my tool.

Can this material’s origin, be the problem even though i am using it with no other negative effects?

if its the origination thats giving me grief. How do i get around it?