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My machine got a bunch of MS patches applied today. After the patch installation and reboot, I started up KSP and I'm having some very strange things occur. A ship which was working just fine, suddenly the RCS thrusters came on and won't shut off causing the ship to (pitch or yaw) rotate, continuously. This was when attempting to fine tune the closest approach to a target, using mechjeb. Also, the math seems to be weird now...the next maneuver node is listed as "1h 95m 76s" away, the ship doesn't seem to want to auto warp...just a ton of things all over the place. I uninstalled and then reinstalled 'better burn time', and 'better warp', and the time for the next node got better, but everything else is still a problem. Maybe uninstall and reinstall mechjeb? So I tried an uninstall and an install of mechjeb. That didn't seem to do much. I also noticed the maneuver icon on the navball is not moving at all. Yes, the ship is changing orientation...it did a full 360 rotation (again I wasn't paying attention to if it was pitch, yaw or some combination) and the maneuver target icon never moved. So it is possible that the patches applied have broken something in mechjeb, or in the game where mechjeb interfaces to it. I'm getting the following error message: Mechjeb module MechjebModuleNodeExecutor threw an exception in OnFixedUpdate: System.NullReferenceException: Object reference not set to an instance of an object: at ManeuverNode.GetBurnVector(.Orbit currentOrbit) [0x00000] in <filename unknown>:0 at MuMech.MechJebModuleNodeExecutor.OnFixedUpdate () [0x00000] in <filename unknown>:0 at MuMech.MechJebCore.FixedUpdate () [0x00000] in <filename unknown>:0 I did try removing the previously set target, and then setting it again, aborted the maneuver node, removed all nodes, asked it to create node, and I get the same burn time, and time to node, and I get the same thing...the ship does a 360 degree rotation, stops close to where it started, but not on the maneuver node icon, which still is not moving when the ship changes attitude.