I have the same beug: http://youtu.be/r1NqFjZEINI in log i see: (Filename: Line: -1) NullReferenceException at (wrapper managed-to-native) UnityEngine.Component:GetComponent (System.Type) at UnityEngine.Component.GetComponent[FARWingAerodynamicModel] () [0x00000] in <filename unknown>:0 at ferram4.FAREditorGUI.Update () [0x00000] in <filename unknown>:0 at ferram4.FAREditorGUI.OnGUI () [0x00000] in <filename unknown>:0 at (wrapper delegate-invoke) Callback:invoke_void__this__ () at RenderingManager.OnGUI () [0x00000] in <filename unknown>:0 and when i remove FAR i have this: NullReferenceException: Object reference not set to an instance of an object at BaseFieldList.get_Item (System.String fieldName) [0x00000] in <filename unknown>:0 at TweakScale.MemberUpdater.Create (System.Object obj, System.String name) [0x00000] in <filename unknown>:0 at TweakScale.ScaleExponents.UpdateFields (System.Object obj, System.Object baseObj, ScalingFactor factor, .Part part) [0x00000] in <filename unknown>:0 at TweakScale.ScaleExponents.UpdateObject (.Part part, .Part prefabObj, System.Collections.Generic.Dictionary`2 exponents, ScalingFactor factor) [0x00000] in <filename unknown>:0 at TweakScale.TSGenericUpdater.OnRescale (ScalingFactor factor) [0x00000] in <filename unknown>:0 at TweakScale.TweakScale.Setup () [0x00000] in <filename unknown>:0 at TweakScale.TweakScale.OnStart (StartState state) [0x00000] in <filename unknown>:0 at Part.ModulesOnStart () [0x00000] in <filename unknown>:0 at Part+ .MoveNext () [0x00000] in <filename unknown>:0 (Filename: Line: -1) sorry for my bad english i'm french