Broken on 5.5.0f3

When I try and open the latest version of Shader Forge (1.30) I get a bunch of errors, starting with this one (happens with new project too):

get_skinIndex is not allowed to be called from a ScriptableObject constructor (or instance field initializer), call it in OnEnable instead. Called from ScriptableObject 'SF_Editor'.See "Script Serialization" page in the Unity Manual for further details.
UnityEditor.EditorGUIUtility:get_isProSkin()
ShaderForge.SF_GUI:get_ProSkin()
ShaderForge.SF_GUI:SkinSuffix(String)
ShaderForge.SF_GUI:get_Icon()
ShaderForge.SF_Editor:.ctor()
UnityEditor.EditorWindow:GetWindow(Type)
ShaderForge.SF_Editor:Init(Shader)
ShaderForge.SF_Editor:InitEmpty()