I just reinstalled KSP and am having trouble getting mechjeb to work (in career or in sandbox). The parts load up just fine and I can attach them to my craft, however I none of the mechjeb GUI shows up when I launch the ship. I unzipped the download file from kerbalspaceport to the GameData folder (so there are both the Squad and MechJeb2 folders there). Was that the correct way to install? Please let me know EDIT: here is some of the logs from output_log.txt Non platform assembly: C:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\GameData\MechJeb2\Plugins\MechJeb2.dll (this message is harmless) AssemblyLoader: Exception loading 'MechJeb2': System.Reflection.ReflectionTypeLoadException: The classes in the module cannot be loaded. at (wrapper managed-to-native) System.Reflection.Assembly:GetTypes (bool) at System.Reflection.Assembly.GetTypes () [0x00000] in <filename unknown>:0 at AssemblyLoader.LoadAssemblies () [0x00000] in <filename unknown>:0 Additional information about this exception: System.TypeLoadException: Could not load type 'MuMech.FuelNode' from assembly 'MechJeb2, Version=2.1.0.0, Culture=neutral, PublicKeyToken=null'. System.TypeLoadException: Could not load type 'MuMech.MechJebModuleStagingController' from assembly 'MechJeb2, Version=2.1.0.0, Culture=neutral, PublicKeyToken=null'. System.TypeLoadException: Could not load type '<SetConsumptionRates>c__AnonStorey2' from assembly 'MechJeb2, Version=2.1.0.0, Culture=neutral, PublicKeyToken=null'. System.TypeLoadException: Could not load type '<CanDrawNeededResources>c__AnonStorey3' from assembly 'MechJeb2, Version=2.1.0.0, Culture=neutral, PublicKeyToken=null'. System.TypeLoadException: Could not load type '<HasStayingChutes>c__AnonStoreyA' from assembly 'MechJeb2, Version=2.1.0.0, Culture=neutral, PublicKeyToken=null'.