NullReferenceException: Object reference not set to an instance of an object; ShaderForge.SF_GUI.AllowIndieRenderTextures ()

When I try to open Shader Forge, only an empty window appears. Also the Refraction shader just stops working after some time.

Edit: Oh well, just imported SF into a new Project from the AssetStore and it worked (but I don't the the floor anymore lol). Doesn't matter, I will stick to Unity 4, just wondered why "Scene Color" doesn't work, seems to be a Unity Pro feature.