I`ve found incorrect scaling bug, 0.1 m stepping even without installed RSS. Might be because in ModuleManager folder file is RealSolarSystem.cfg not RealSolarSystem.cfg.notused . Also, fuel tanks are empty. Again. Also, first attempt of changing size is successful while any next makes no change to part`s size, it`s like freezing. Meanwhile decouplers works well(except of 0.1 m scaling) but now they are 20 kg for 0.625. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object at ProceduralParts.TankContentSwitcher.UpdateMassAndResources (Boolean typeChanged) [0x00000] in <filename unknown>:0 at ProceduralParts.TankContentSwitcher.ChangeVolume (Single volume) [0x00000] in <filename unknown>:0 at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0 at KSPAPIExtensions.PartMessage.ServiceImpl.Send (KSPAPIExtensions.PartMessage.CurrentEventInfoImpl message) [0x00000] in <filename unknown>:0 at KSPAPIExtensions.PartMessage.ServiceImpl+MessageConsolidator.Dispose () [0x00000] in <filename unknown>:0 at ProceduralParts.ProceduralAbstractShape.Update () [0x00000] in <filename unknown>:0