Are you using Forward Rendering? I think I remember that there was a bug in 4.16.x where materials will look very dark in the material editor preview if FR was turned on. It has been fixed in 4.17 and higher.
Are you using Forward Rendering? I think I remember that there was a bug in 4.16.x where materials will look very dark in the material editor preview if FR was turned on. It has been fixed in 4.17 and higher.