My bad, I meant to edit with the player.log stuff and forgot to. The entire thing is 11.8MB, but these are the lines from when I loaded a craft and added the OX-STAT panels at 2x symmetry to the mk1 pod (though it happens when the craft already has panels too): Autogen thumbnail for /home/ben/.local/share/Steam/steamapps/common/Kerbal Space Program/KSP_Data/../thumbs/Ben_VAB_Quick Minmus Hopper.png from /home/ben/.local/share/Steam/steamapps/common/Kerbal Space Program/saves/Ben/Ships/VAB/Quick Minmus Hopper.craft (Filename: /home/builduser/buildslave/unity/build/artifacts/LinuxStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56) NullReferenceException: Object reference not set to an instance of an object at TweakableEverything.ModuleTweakableDeployablePanel.LateUpdate () [0x00000] in <filename unknown>:0 (Filename: Line: 4294967295) The exception repeats a bunch until I get to the lines showing where I alt+F4'd. Let me know if you want anything else from the log though. Edit: To clarify, the exception starts happening as soon as the OX STAT panels are clicked on, even before they're added to the craft.