I have same problem. Any glues how to get it back? Log file: https://drive.google.com/file/d/0BwTO_H8RhTi0MDVsQ01saW5hbXc/view?usp=sharing content of mechjeb2.log: Executing: MechJeb2 - 2.5.0.0Assembly: /home/sauli/app/ksp/1.0_run/GameData/MechJeb2/Plugins/MechJeb2.dll [Exception 16:38:59.9348690]: []: at (wrapper managed-to-native) UnityEngine.Component:InternalGetTransform () at UnityEngine.Component.get_transform () [0x00000] in <filename unknown>:0 at KerbalEngineer.VesselSimulator.PartSim.New (.Part thePart, Int32 id, Double atmosphere, KerbalEngineer.LogMsg log) [0x00000] in <filename unknown>:0 at KerbalEngineer.VesselSimulator.Simulation.PrepareSimulation (System.Collections.Generic.List`1 parts, Double theGravity, Double theAtmosphere, Double theMach, Boolean dumpTree, Boolean vectoredThrust, Boolean fullThrust) [0x00000] in <filename unknown>:0 at KerbalEngineer.VesselSimulator.SimManager.StartSimulation () [0x00000] in <filename unknown>:0