Cycles renders object deep purple I've been following this tutorial (using blender 2.8). At around 14:15 a sphere is created and a texture with some modifiers wrapped onto it; this is what I get when following the tutorial exactly:

With Eevee:



With Cycles:



Why does Cycles forget about the nodes? 

I created the shader with "All" as the output. 

Tried redoing the material directly in Cycles; now the sphere is purple by default and remains so even after the texture has been added.
I was able to recreate the problem: it seems to be caused by setting material output to Cycles (in the material editor) while rendering with Eevee (in the render settings). The only solution I know is to render with the same render engine as you specify in the material.