Got the same problem as OwDoge, MFT is not working properly for me in .24.2 (Windows 32bit.) It initializes the tanks properly, but won't let me actually modify the tanks. All I can do is remove them and don't get any space back. Tried this with both the bundled KAE and the newest version Exception when attempting to register listener: RealFuels.ModuleFuelTanks, modularFuelTanks, Version=5.1.0.0, Culture=neutral, PublicKeyToken=null.PartVolumeChanged ArgumentException: Message argument is null at KSPAPIExtensions.PartMessage.PartMessageListener..ctor (System.Type delegateType, PartRelationship relations, GameSceneFilter scenes) [0x00000] in <filename unknown>:0 at (wrapper managed-to-native) System.MonoCustomAttrs:GetCustomAttributesInternal (System.Reflection.ICustomAttributeProvider,System.Type,bool) at System.MonoCustomAttrs.GetCustomAttributesBase (ICustomAttributeProvider obj, System.Type attributeType) [0x00000] in <filename unknown>:0 at System.MonoCustomAttrs.GetCustomAttributes (ICustomAttributeProvider obj, System.Type attributeType, Boolean inherit) [0x00000] in <filename unknown>:0 at System.MonoCustomAttrs.GetCustomAttributes (ICustomAttributeProvider obj, Boolean inherit) [0x00000] in <filename unknown>:0 at System.Reflection.MonoMethod.GetCustomAttributes (Boolean inherit) [0x00000] in <filename unknown>:0 at KSPAPIExtensions.PartMessage.ServiceImpl.Register[ModuleFuelTanks] (RealFuels.ModuleFuelTanks obj) [0x00000] in <filename unknown>:0 UnityEngine.Debug:Internal_LogException(Exception, Object) UnityEngine.Debug:LogException(Exception) RealFuels.ModuleFuelTanks:OnAwake() PartModule:Awake() UnityEngine.GameObject:SetActive(Boolean) EditorLogic:OnPodSelect(AvailablePart) EditorLogic:SpawnPart(AvailablePart) EditorPartList:CreateEditorPart(AvailablePart) EditorPartList:TapIcon(AvailablePart) EditorPartIcon:OnTap() EditorPartIcon:MouseInput(POINTER_INFO&) UIButton:OnInput(POINTER_INFO&) AutoSpriteControlBase:OnInput(POINTER_INFO) UIManager:DispatchHelper(POINTER_INFO&, Int32) UIManager:DispatchInput() UIManager:Update() and NullReferenceException: Object reference not set to an instance of an object at RealFuels.ModuleFuelTanks.RaiseResourceListChanged () [0x00000] in <filename unknown>:0 at RealFuels.ModuleFuelTanks+FuelTank.set_maxAmount (Double value) [0x00000] in <filename unknown>:0 at RealFuels.ModuleFuelTanks.Empty () [0x00000] in <filename unknown>:0 at BaseEvent.Invoke () [0x00000] in <filename unknown>:0 at UIPartActionButton.OnClick () [0x00000] in <filename unknown>:0 and many more... definetely problems with MFT