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Michel Bartolone

VAB symmetry issue


I checked the forums, but have not found anything similar to this. Running 1.5.1, with a bunch of mods. Upgraded KIS yesterday, and now, I attach radial decouplers with 4 way symmetry, but when I try to attach fuel tanks using the same symmetry mode, I only get 1. SRBs are still working, but not fuel tanks. I have not tried any other parts yet. Has anyone seen this?

Additional info. 2 way symmetry is partially working...I put on two radial decouplers using symmetry, I can put on two tanks, BUT the physical offset of the one on the "back" is to the connector facing the central tank instead of the outer one. If I don't use a decoupler, the tanks go where they belong. If I change to 3, 4, 6 or 8 way, the decoupler attaches to the central object (tank) just fine, but I when I attempt to attach tanks to those decouplers, I only get one tank. Also, with 3,4,6 or 8 way symmetry, even without the decouplers, I only get one.

Here is my mod list:
[x] Science! (xScience vV5.17)
ABookCase Orbital Reference System (ABCORS
Astrogator (Astrogator v0.8.1)
AT Utils (AT-Utils v1.6.2)
AutomatedScienceSampler (AutomatedScienceSampler 1.3.5)
B9 Part Switch (B9PartSwitch v2.4.5)
BetterBurnTime (BetterBurnTime 1.7)
BetterTimeWarpContinued (BetterTimeWarpCont
Blast Awesomeness Modifier (BAM) (BAMCont
BurnTogether Continued (BurnTogetherContinued
ClickThrough Blocker (ClickThroughBlocker
Community Resource Pack (CommunityResourcePack
Community Tech Tree (CommunityTechTree 1:3.3.3)
Configurable Containers (ConfigurableContainers
Configurable Containers Core (ConfigurableContainers-Core
Craft Manager (CraftManager 1.1.4)
CraftHistory (CraftHistory 2.2.1)
DarkSideTechnology Continued. (DarkSideTechnology 1.1)
DMagic Orbital Science (DMagicOrbitalScience 1.4.1)
DMModuleScienceAnimateGeneric (DMagicScienceAnimate v0.20)
Docking Port Alignment Indicator (DockingPortAlignmentIndicator 6.8.2)
Docking Port Sound FX (DockingPortSoundFX v2.1.12)
Dr. Jet's Chop Shop (ChopShop 1:
Draggable Altimeter (DraggableAltimeter v1.0.1)
Draggable Navball (DraggableNavball v1.0.1)
Easy Vessel Switch (EVS) (EasyVesselSwitch 1.9)
Editor Extensions Redux (EditorExtensionsRedux
EVA Enhancements Continued (EVAEnhancementsContinued
Eva Follower (EvaFollower
EVA Struts (EVAStruts 5.0)
EVA Transfer (EVATransfer 8.1)
FASA RCS Stock-Like Mini Mod (FASA-RCS 1.3)
Firespitter Core (FirespitterCore v7.9.0)
Fuel Tank Expansion Rebuilt (MunarIndustriesFTX
GravityTurn Continued (GravityTurnContinued 2:1.7.7)
HangerExtender (HangerExtenderExtended
HullcamVDS Continued (HullcamVDSContinued
Impact! (Impact v1.6.4)
Improved Chase Camera (ImprovedChaseCamera v1.6.2.1)
IndicatorLights (IndicatorLights 1.4)
Kerbal Attachment System (KAS 1.1)
Kerbal Dust Experiment (KDEX v1.11.2)
Kerbal Inventory System (KIS 1.16)
KerboKatzUtilities (KerboKatzUtilities 1.5.2)
KrakenScience (KrakenScience 0.8)
KSP ExtendedAntennaProgression (ExtendedAntennaProgression v0.1.1)
KSP Wheel (KSPWheel
Lithobrake Exploration Technologies (LithobrakeExplorationTechnologies 0.4)
LongStrut (LongStrut 0.0.1)
MagiCore (MagiCore
MandatoryRCS Part Pack (MandatoryRCSPartPack 1.1)
Maneuver Node Evolved (ManeuverNodeEvolved 4.0)
MechJeb 2 (MechJeb2
MechJeb and Engineer for all! (MechJebForAll
Module Manager (ModuleManager 3.1.0)
Navball Docking Alignment Indicator CE-2 (NavballDockAlignIndCE
NavBallAdjustor (NavBallAdjustor 1.9)
Nehemiah Engineering Orbital Science (NehemiahEngineeringOrbitalScience 0.8.0)
Orbital Survey Plus (OrbitalSurveyPlus 2.3.6)
Patch Manager (PatchManager
Precise Maneuver (PreciseManeuver 2:2.4.1)
QuickSearch (QuickSearch 1:
RasterPropMonitor (RasterPropMonitor 1:v0.30.5)
RasterPropMonitor Core (RasterPropMonitor-Core 1:v0.30.5)
RealChute Parachute Systems (RealChute v1.4.7.1)
SCANsat (SCANsat v18.8)
Science - Full reward! (NMSG 3.0)
Science Revisited Revisited (ScienceRevisitedRevisited 1.7.1)
Selectable Data Transmitter Module (SelectableDataTransmitter
Settings Master (SettingsMaster
Solar Science (SolarScience v1.06)
Space Launch System Part Pack (SpaceLaunchSystemPartPack
Structural Disks (StructuralDisks
Structural Tubing Restructured (StructuralTubing
Surface Mounted Lights (surfacelights 1.9)
TakeCommandContinued (TakeCommandContinued
Textures Unlimited (TexturesUnlimited
Toolbar (Toolbar
Toolbar Controller (ToolbarController 1:
Tough Love (ToughLove 0.0.1)
Tracking Station Evolved (TrackingStationEvolved 4.0)
Trajectories (Trajectories vKSP1.4.2-v2.2.0)
TweakScale - Rescale Everything! (TweakScale v2.4.0.6)
UbioZur Welding Ltd. Continued (UbioWeldContinued 2.5.3)
Wheels Collection (formerly rollkage & better wheels)  (WheelsCollection 1.3)
WorldStabilizer (WorldStabilizer 0.9.3)

If I can figure out how to attach screen shots, I've got a few, showing I can use 2x symmetry sort of...it turns out the second tank is actually only getting attached to the same radial coupler as the first tank, the second radial coupler can have another tank (or two) attached to it separately. Attaching tanks to tanks works just fine in 2x symmetry, decouplers themselves work with 2x, 3x, 4x, 6x, and 8 x symmetry, but nothing (other than engines) will attach in any of the radial decouplers in any symmetry mode other than 2x.



I also found the following message (multiple times...a lot of multiple times) in the log:
Parameter name: index
    System.Collections.Generic.List`1[PartResource].get_Item (Int32 index)
    DictionaryValueList`2[System.Int32,PartResource].At (Int32 index)
    PartResourceList.get_Item (Int32 index)
    Part.OnCopy (.Part original, Boolean asSymCounterpart)
    EditorLogic.createSymmetry (Int32 mode, .Attachment attach)
    EditorLogic.<SetupFSM>m__D ()
    KerbalFSM.UpdateFSM ()
    EditorLogic.Update ()
[EXC 09:21:28.918] ArgumentOutOfRangeException: Argument is out of range.

Edited by Michel Bartolone
additional info

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5 answers to this question

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I came here looking for answers to the exact same issue.

My mods list is about 20% as long as yours, so it may help to narrow things down.

I got:

  • Near Future Everything
  • B9PartSwitch
  • DeployableEngines
  • Mk4
  • KIS
  • KAS-1.0 Beta10
  • TextureReplacer
  • Kopernicus
  • Galileo Planets
  • Universal Storage II
  • Dmagic Science
  • Scansat
  • EVE
  • Station Parts Redux
  • MKS with USI and Ground Construction
  • ASET
  • MechJeb2
  • Kerbal Atomics
  • Astrogator
  • Final Frontier
  • KSTS

I can't see anything on my own list that would mess with that find of functionality.  KAS maybe...I'll remove it and see what happens.


Removed KAS and everything works peachy now.

Update 2:

Did even more testing.  KAS again, for sure, is broken.  However, no issue is reported I could find on his Github or his thread.  It may be an interaction with another mod, but I couldn't figure out which without breaking my game entirely.  The only conflicting mod I know could be MKS that uses the same logic for its strut tubes, but that's not on your list.

Short term answer is no more KAS.

Edited by PolecatEZ
Found the culprit

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I was just about to post a new topic for this issue, luckily I found this first.

I have pretty much the same mod list as OP.

Here's the output_log: output_log.txt

If KAS is really the problem, and the only solution is to unistall it, that'd be a real bummer.

Thank you in advance for your help!

Edited by Bartholomew

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I take it back.  The bug returned even with KAS out, it just took longer to pop up in a building session.

I'm doing a full mod strip to see if its a stock problem.


Fully stripped the game to pure stock, could not get the bug to trigger.

I have 2 more suspects on my list, Dmagic and B9 Part Switcher, also fresh game vs updated save from 1.4.5 to 1.5.1


Update 2:

Dmagic eliminated as a cause.  Its safe.  Ditto for KAS and KIS.

B9 Part Switcher will be fun to test.


Update 3:

Took out B9 part switcher, but it removed all the fuel from my stock tanks.  In hunting down the cause for that, I found and eliminated the CryoTanks folder that came from various Nertea mods.

Put B9 switcher back in.

I can no longer reproduce the bug.  I also can no longer switch fuels on the stock tanks, but that's not something I ever really used anyways.

I'll keep testing to see if its just that config script or the .dll that's the problem.


Update 4: Conclusion

CryoTanksFuelTankSwitcher.cfg was the source of my own issues, located in the Cryotanks/Patches folder

Its not bad per se, but it basically causes B9 Part Switcher to conflict with Squad's Stock color switcher.

I assume anything that overrides Squad stock parts by messing with their fuel may also cause this kind of issue, even if you're not using Cryotanks or Cryoengines from NFT or FFT packs.

Since taking out that patch, I've been hitting the VAB pretty hard for about an hour and haven't seen the bug reproduced.  All other mods are in and working just fine.


Edited by PolecatEZ

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Latest B9 Partswitch and 1.5 version of Nertea's Cryotanks seems to have fixed everything now also.


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