Quote - Does reality support the Shader Mixer/Builder shaders?  I had a character in poser, brought to Daz, but it was using a black leather procedural material.  I found a decent leather material for the Shader Mixer, applied it, but in Reality it seems to come out just flat black?

If not, is there a way to do a similar leather type of material on a materiall zone?

No, procedural textures intended for 3Delight rendering will not work in Luxrender, which has its own materials and procedural textures (and the latter are not available from Reality). Reality translates shader information as far as it is able to channels available to Luxrender, but you are limited to the material types, and their parameters, that you can see as options in Reality.

In order to get a leather texture you will require the appropriate image map, specular, bump map, etc. Luxrender via Reality is capable of recreating a highly realistic leather texture with some or all of these, but not procedurally. Have a look at the material parameters that Reality has imported, and I think you will find that it is just a diffuse colour with its attendant parameters.

If you are rendering in Reality/Luxrender, you can forget all about those fancy shader settings in DAZ and work on your shaders in Reality using its conversions as a starting point. Or if it is something like metal or glass, just change the material type to that. (By the way, if your metal surface has a map, make sure the metal material is set to custom so that the map is used. Custom metals with maps look incredibly good.) However, I can't imagine how you can make a convincing leather without maps as leather has a definite texture—without that it is just going to look something like plastic or rubber.