Blend Material appears either/or

I’m using the ‘Blend’ material for the first time, which I’ve only just noticed.

At 0.50 Blend Amount and under, it appears 100% Material 1. At 0.51 and over, it appears 100% Material 2.

I’ve wanted a way to have multiple color/diffuse textures for years, but this doesn’t seem to work for me.

Rendered mode doesn’t do Blend material yet ( RH-70280 Blend material does not work in the display )

It does work in Raytraced and Rhino Render though

Blend amount doesn’t appear to do much in Raytraced/Rhino Render when you have a texture set, though. But it does work when no texture is set.