I've been working with ShaderGraph for the last few days and have made a few shaders. I've been following various tutorials, but now ShaderGraph seems to create blank shaders that don't have a preview and don't make a working material. Take for example this toon shader where I'm following this tutorial https://www.patreon.com/posts/converting-some-24781996: It should look something like this: But it looks like this: No previews in the nodes and no main preview (and not shown here: no effect on a material or the object the material is used by). Even a super simple one is duff: I have had working shaders from ShaderGraph, but now all of the ones I try are like this: lots of nodes and trees, but the previews are blank and the shader has no effect on the scene. Any ideas what this is? Or how to troubleshoot it?