Hello,
I just downloaded Samples 4.9 Preview rev1 and having a little problems.
Samples run fine initially but as soon as I open VFX files in the vfx editor, they are permanently broken. I guess editor overrides some parameters or something on window initialization or something?

In example, voxel terrain demo looks like this after loading graph;

Genie

Radar;

I'm using 2018.3.3f1
Visual Effect Graph 4.9.0