docking causes decouplers to fire (again)?

[Michel Bartolone]

I had this issue some time last year, and IIRC, I had to do a full reinstall and start again.  It's back!

I've got a minimal space station (really just a probe core, some LFO and monoprop fuel tanks, some batteries and a couple of docking ports). I docked a second identical vessel, and everything is fine. Then I brought a lander and docked it. So far everything is still OK. I flew a crew out and docked. Everything is still fine. Crew transferred to the lander. Lander goes down to the surface (Minmus in this case) gets a bunch of science, gets back into orbit, rendezvous with the station, and I go in to dock. Everything is aligned, I move in slowly (less than .25m/s) and as soon as the lander makes contact with the station, two decouplers fired! One for an empty fuel tank, which was no big deal, the second one was the decoupler between the command pod heat shield and everything below it!

Recently I had another, unrelated issue, that caused me to try a new full install of the last version of KSP, along with the latest Breaking Ground and Making History DLCs, and a bunch of mods (other than Restock, Restock+, and Restock Extra -Rigid Legs, which are supposed to only reskin some parts, I don't think I've added any parts).  Here is the mod list:

ABookCase Orbital Reference System (ABCORS 0.5.1.6)
Adjustment Tool (AdjustmentTool v0.0.3)
Alarm Enhancements (AlarmEnhancements 1.0.2)
Astrogator (Astrogator v1.0.0)
BetterTimeWarpContinued (BetterTimeWarpCont 2.3.13)
Breaking Ground (BreakingGround-DLC 1.7.1)
ClickThrough Blocker (ClickThroughBlocker 1:2.1.10.21)
Community Category Kit (CommunityCategoryKit v112.0.1)
Community Delta-V Maps (CommunityDeltaVMaps 2:2.8)
Community Parts Titles (CommunityPartsTitles 0.9.3)
Community Parts Titles Extras: Categories (CommunityPartsTitlesExtrasCategory 0.9.3)
Community Parts Titles Extras: CCK - No Duplicates (CommunityPartsTitlesExtrasNoCCKDup 0.9.3)
Community Resource Pack (CommunityResourcePack v112.0.1)
Community Tech Tree (CommunityTechTree 1:3.4.4)
Docking Port Alignment Indicator (DockingPortAlignmentIndicator 6.10.0.0)
Draggable Controls (DraggableControls v1.0.0)
Easy Vessel Switch (EVS) (EasyVesselSwitch 2.3)
EngineTweaks for MakingHistory (MakingHistoryEngineTweaks v1)
Filter Extensions - Default Configuration (FilterExtensionsDefaultConfig 3.2.8)
Filter Extensions - Plugin (FilterExtensions 3.2.8)
Hangar Extender (HangerExtenderExtended 3.6.0.2)
Hangar Grid Regridded (HangarGrid 1:0.4.1.1)
Harmony 2 (Harmony2 2.2.1.0)
HeapPadder (HeapPadder 0.0.2.4)
Hide Empty Tech Tree Nodes (HideEmptyTechNodes 1.3.2)
Kerbal Alarm Clock (KerbalAlarmClock v3.14.0.0)
Kerbal Attachment System (KAS 1.12)
Kerbal Engineer Redux (KerbalEngineerRedux 1.1.9.0)
Kerbal Inventory System (KIS 1.29)
Kerbal Joint Reinforcement - Next (KerbalJointReinforcementNext v4.1.19)
KSP Achievements (Achievements 1.10.1.8)
KSP Community Fixes (KSPCommunityFixes 1.24.5)
KSP Craft Organizer Improved (VAB/SPH tags + craft searching) (KspCraftOrganizer 1.7.2.2)
KSP Recall (KSP-Recall v0.3.0.8)
KSP Resonant Orbit Calculator (ResonantOrbitCalculator 0.0.7)
KSP Wheel (KSPWheel 1:0.16.14.33)
Making History (MakingHistory-DLC 1.12.1)
MechJeb 2 (MechJeb2 2.14.2.0)
Module Manager (ModuleManager 4.2.2)
Notes (notes 0.17.0.0-adoption)
Parking Brake (ParkingBrake 0.4.4)
Part Wizard Continued (PartWizardContinued 1.3.11)
Patch Manager (PatchManager 0.0.17.6)
Project Manager (ProjectManager v2.4)
QuantumStrutsContinued (QuantumStrutsContinued 1.7.5.4)
RasterPropMonitor (RasterPropMonitor 1:v0.31.10.1)
RasterPropMonitor Core (RasterPropMonitor-Core 1:v0.31.10.1)
RCS Build Aid (RCSBuildAid v1.0.6)
Real Plume (RealPlume 2:v13.3.2)
Real Plume - Stock Configs (RealPlume-StockConfigs v4.0.8)
ReStock (ReStock 1.4.3)
ReStock Extra - Rigid Legs (RestockRigidLegs 1.4.3)
ReStock+ (ReStockPlus 1.4.3)
S.A.V.E Resaved (SAVE 1.11.0.3)
ScienceAlert ReAlerted (ScienceAlert 1.9.20.2)
Ship Manifest (ShipManifest 6.0.6.0)
SmokeScreen - Extended FX Plugin (SmokeScreen 2.8.14.0)
Space Age (SpaceAge v1.3.7)
SpaceTux Library (SpaceTuxLibrary 0.0.8.5)
Speed Unit Annex (SpeedUnitAnnex 1.4.4)
Station Keeping (StationKeeping 1:0.2.3)
Targetron Adopted (Targetron v1.7.0.1)
Toolbar Controller (ToolbarController 1:0.1.9.9)
TooManyOrbits (TooManyOrbits 1.1.6.6)
Tracking Station Evolved (TrackingStationEvolved 7.0)
Trackingstation Ambientlight (TrackingStationAmbientlight 0.3.4)
Trajectories (Trajectories v2.4.3)
TriggerAu Flags (TriggerAu-Flags v2.11.0.0)
TweakScale - Rescale Everything! (TweakScale v2.4.6.19)
TweakScale Redistributable (TweakScale-Redist v2.4.6.19)
Waterfall - Restock (WaterfallRestock 0.2.3)
Waterfall Core (Waterfall 0.9.0)
WaypointManager (WaypointManager 2.8.3.5)
Zero MiniAVC (ZeroMiniAVC 1:1.1.3.2)
 

 

[Michel Bartolone]

It took several hours, but I figured it out...MechJeb was set to auto stage, and it seems that docking causes it to trigger.