Dumb question: but I'm a newbie and I can't find any instructions in the Manual. It says to  save a "shader" if you have made one, but how?

Also, another dumb question from a dumb newbie. How can I save out or export a prop that I've made and made the materials for (into a shader), so that I don't have to retexture this thing whenever I want to use the prop again?

While in the Material Room, select the Materials tab of the Library and either select or create a folder to save your new material shader(s).  At the bottom left side of the Library, click on the '+' icon to begin the save dialog.  Enter a name for the file and select whether the shader is a single material or a material collection.  A single material is an MT5 file that can be applied to a single material zone of an object or figure.  If the file you are creating applies to more than one material zone, select Material Collection and tick on or off those zones you want included in the MC6 file.  After you are done, click OK to complete the process.

To save a new prop, select the Props tab of the Library, select or create a new folder and, like the process above, click on the '+' icon located on the lower left side corner.  Give it an identifying name.  This process will save the prop with its shaders.

A very big THANK YOU!!!!!!!!!

Wonderful!  Works Well!