diff --git a/Upgrade.lua b/Upgrade.lua
index 0dc92fc..71c2525 100755
--- a/Upgrade.lua
+++ b/Upgrade.lua
@@ -2,7 +2,6 @@ local upgrade = {}
 
 -- imports
 
-local squadAttack = require("libs/SquadAttack")
 local constants = require("libs/Constants")
 local mathUtils = require("libs/MathUtils")
 
@@ -17,8 +16,6 @@ local SQUAD_GUARDING = constants.SQUAD_GUARDING
 
 -- imported functions
 
-local scoreAttackLocation = squadAttack.scoreAttackLocation
-
 local roundToNearest = mathUtils.roundToNearest
 
 -- module code
@@ -245,14 +242,16 @@ function upgrade.attempt(natives)
         game.surfaces[natives.activeSurface].print("Rampant - Version 0.16.37")
 	global.version = constants.VERSION_72
     end
-    if (global.version < constants.VERSION_73) then
+    if (global.version < constants.VERSION_74) then
 
-	for _,squad in pairs(natives.squads) do
-	    squad.attackScoreFunction = scoreAttackLocation
+        for _,squad in pairs(natives.squads) do
+	    squad.status = SQUAD_GUARDING
+            squad.cycles = 0
+            squad.attackScoreFunction = nil
     	end
 
-        game.surfaces[natives.activeSurface].print("Rampant - Version 0.16.38")
-	global.version = constants.VERSION_73
+        game.surfaces[natives.activeSurface].print("Rampant - Version 0.16.39")
+	global.version = constants.VERSION_74
     end
 
     return starting ~= global.version, natives
diff --git a/changelog.txt b/changelog.txt
index cba9d94..511476b 100755
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,10 @@
+---------------------------------------------------------------------------------------------------
+Version: 0.16.39
+Date: 2. 15. 2019
+  Bugfixes:
+    - Reset squad scoring functions and set default scoring function
+    - Switched to single instance require statements causing multiple sentinel memory objects
+
 ---------------------------------------------------------------------------------------------------
 Version: 0.16.38
 Date: 2. 14. 2019
diff --git a/control.lua b/control.lua
index f32422b..660e1b1 100755
--- a/control.lua
+++ b/control.lua
@@ -582,8 +582,7 @@ local function onSurfaceTileChange(event)
 	    local position = tiles[i].position
 	    local chunk = getChunkByPosition(map, position, true)
 
-	    -- weird bug with table pointer equality using name instead of pointer comparison
-	    if not chunk.name then
+	    if (chunk ~= SENTINEL_IMPASSABLE_CHUNK) then
 		map.chunkToPassScan[chunk] = true
 	    else
 		local x,y = positionToChunkXY(position)
diff --git a/info.json b/info.json
index a59a47e..e5e3b78 100755
--- a/info.json
+++ b/info.json
@@ -1,7 +1,7 @@
 {
     "name" : "Rampant",
     "factorio_version" : "0.16",
-    "version" : "0.16.38",
+    "version" : "0.16.39",
     "title" : "Rampant",
     "author" : "Veden",
     "homepage" : "https://forums.factorio.com/viewtopic.php?f=94&t=31445",
diff --git a/libs/AIAttackWave.lua b/libs/AIAttackWave.lua
index 36d8960..6696f6e 100755
--- a/libs/AIAttackWave.lua
+++ b/libs/AIAttackWave.lua
@@ -1,3 +1,6 @@
+if (aiAttackWaveG) then
+    return aiAttackWaveG
+end
 local aiAttackWave = {}
 
 -- imports
@@ -256,4 +259,5 @@ function aiAttackWave.formSquads(map, surface, natives, chunk, cost)
     return (natives.points - cost) > 0
 end
 
+aiAttackWaveG = aiAttackWave
 return aiAttackWave
diff --git a/libs/AIPlanning.lua b/libs/AIPlanning.lua
index fc02d6b..571ded2 100755
--- a/libs/AIPlanning.lua
+++ b/libs/AIPlanning.lua
@@ -1,3 +1,6 @@
+if aiPlanningG then
+    return aiPlanningG
+end
 local aiPlanning = {}
 
 -- imports
@@ -145,4 +148,5 @@ function aiPlanning.planning(natives, evolution_factor, tick, surface, connected
 
 end
 
+aiPlanningG = aiPlanning
 return aiPlanning
diff --git a/libs/AIPredicates.lua b/libs/AIPredicates.lua
index 88db393..8e41802 100755
--- a/libs/AIPredicates.lua
+++ b/libs/AIPredicates.lua
@@ -1,3 +1,6 @@
+if (aiPredicatesG) then
+    return aiPredicatesG
+end
 local aiPredicates = {}
 
 -- imports
@@ -33,4 +36,5 @@ function aiPredicates.canMigrate(natives, surface)
                 (natives.aiNocturnalMode and surface.darkness > 0.65))
 end
 
+aiPredicatesG = aiPredicates
 return aiPredicates
diff --git a/libs/BaseUtils.lua b/libs/BaseUtils.lua
index f197fd9..dee1af7 100755
--- a/libs/BaseUtils.lua
+++ b/libs/BaseUtils.lua
@@ -1,3 +1,6 @@
+if baseUtilsG then
+    return baseUtilsG
+end
 local baseUtils = {}
 
 -- imports
@@ -828,4 +831,5 @@ function baseUtils.rebuildNativeTables(natives, surface, rg)
     natives.evolutionTableWorm = normalizeProbabilities(natives.evolutionTableWorm)
 end
 
+baseUtilsG = baseUtils
 return baseUtils
diff --git a/libs/BobsBaseUtils.lua b/libs/BobsBaseUtils.lua
index 7718dac..5d19ca2 100755
--- a/libs/BobsBaseUtils.lua
+++ b/libs/BobsBaseUtils.lua
@@ -1,3 +1,6 @@
+if bobsBaseUnits then
+    return bobsBaseUnits
+end
 local bobs = {}
 
 -- imports
@@ -118,4 +121,5 @@ function bobs.processBobsUnitClass(natives, surface)
 
 end
 
+bobsBaseUnits = bobs
 return bobs
diff --git a/libs/ChunkProcessor.lua b/libs/ChunkProcessor.lua
index 67033f4..a922722 100755
--- a/libs/ChunkProcessor.lua
+++ b/libs/ChunkProcessor.lua
@@ -1,3 +1,6 @@
+if (chunkProcessorG) then
+    return chunkProcessorG
+end
 local chunkProcessor = {}
 
 -- imports
@@ -159,4 +162,5 @@ end
 -- end
 
 
+chunkProcessorG = chunkProcessor
 return chunkProcessor
diff --git a/libs/ChunkPropertyUtils.lua b/libs/ChunkPropertyUtils.lua
index d51cb8a..7cea62c 100755
--- a/libs/ChunkPropertyUtils.lua
+++ b/libs/ChunkPropertyUtils.lua
@@ -1,3 +1,6 @@
+if chunkPropertyUtilsG then
+    return chunkPropertyUtilsG
+end
 local chunkPropertyUtils = {}
 
 local constants = require("Constants")
@@ -74,7 +77,7 @@ function chunkPropertyUtils.getRallyTick(map, chunk)
 end
 
 function chunkPropertyUtils.setRallyTick(map, chunk, tick)
-    map.chunkToRallys[chunk] = tick 
+    map.chunkToRallys[chunk] = tick
 end
 
 function chunkPropertyUtils.setRetreatTick(map, chunk, tick)
@@ -147,7 +150,7 @@ function chunkPropertyUtils.decayDeathGenerator(map, chunk)
 	else
 	    map.chunkToDeathGenerator[chunk] = gen
 	end
-    end    
+    end
 end
 
 function chunkPropertyUtils.getPlayerBaseGenerator(map, chunk)
@@ -160,12 +163,12 @@ function chunkPropertyUtils.addSquadToChunk(map, chunk, squad)
     if squad.chunk ~= chunk then
 	chunkPropertyUtils.removeSquadFromChunk(map, squad)
     end
-    
+
     if not chunkToSquad[chunk] then
 	chunkToSquad[chunk] = {}
     end
     chunkToSquad[chunk][squad] = squad
-    
+
     squad.chunk = chunk
 end
 
@@ -204,4 +207,5 @@ function chunkPropertyUtils.addPlayerBaseGenerator(map, chunk, playerGenerator)
     map.chunkToPlayerBase[chunk] = (map.chunkToPlayerBase[chunk] or 0) + playerGenerator
 end
 
+chunkPropertyUtilsG = chunkPropertyUtils
 return chunkPropertyUtils
diff --git a/libs/ChunkUtils.lua b/libs/ChunkUtils.lua
index 85c2f12..bebee79 100755
--- a/libs/ChunkUtils.lua
+++ b/libs/ChunkUtils.lua
@@ -1,3 +1,6 @@
+if chunkUtilsG then
+    return chunkUtilsG
+end
 local chunkUtils = {}
 
 -- imports
@@ -547,4 +550,5 @@ function chunkUtils.makeImmortalEntity(surface, entity)
     newEntity.destructible = false
 end
 
+chunkUtilsG = chunkUtils
 return chunkUtils
diff --git a/libs/Constants.lua b/libs/Constants.lua
index a9d6e83..ff6db28 100755
--- a/libs/Constants.lua
+++ b/libs/Constants.lua
@@ -1,3 +1,6 @@
+if constantsG then
+    return constantsG
+end
 local constants = {}
 
 -- versions
@@ -23,6 +26,7 @@ constants.VERSION_51 = 51
 constants.VERSION_57 = 57
 constants.VERSION_72 = 72
 constants.VERSION_73 = 73
+constants.VERSION_74 = 74
 
 -- misc
 
@@ -710,4 +714,5 @@ constants.POISON_UNIT_TIERS = unitTiers
 constants.POISON_UNIT_VARIATIONS = unitVariations
 
 
+constantsG =  constants
 return constants
diff --git a/libs/Interop.lua b/libs/Interop.lua
index 2479a98..8c87f2e 100755
--- a/libs/Interop.lua
+++ b/libs/Interop.lua
@@ -1,3 +1,6 @@
+if interopG then
+    return interopG
+end
 local interop = {}
 
 local unitGroupUtils = require("UnitGroupUtils")
@@ -84,4 +87,5 @@ function interop.registerUnitGroup(unitGroup)
     unitGroupUtils.createSquad(unitGroup.position, unitGroup.surface, global.natives, unitGroup)
 end
 
+interopG = interop
 return interop
diff --git a/libs/MapProcessor.lua b/libs/MapProcessor.lua
index 5e542ec..484619c 100755
--- a/libs/MapProcessor.lua
+++ b/libs/MapProcessor.lua
@@ -1,3 +1,6 @@
+if mapProcessorG then
+    return mapProcessorG
+end
 local mapProcessor = {}
 
 -- imports
@@ -307,4 +310,5 @@ function mapProcessor.scanMap(map, surface, natives, tick)
     end
 end
 
+mapProcessorG = mapProcessor
 return mapProcessor
diff --git a/libs/MapUtils.lua b/libs/MapUtils.lua
index 8482896..86c2db8 100755
--- a/libs/MapUtils.lua
+++ b/libs/MapUtils.lua
@@ -1,3 +1,6 @@
+if mapUtilsG then
+    return mapUtilsG
+end
 local mapUtils = {}
 
 -- imports
@@ -87,11 +90,11 @@ function mapUtils.getNeighborChunks(map, x, y)
         neighbors[5] = xChunks[y] or SENTINEL_IMPASSABLE_CHUNK
         neighbors[8] = xChunks[chunkYRow3] or SENTINEL_IMPASSABLE_CHUNK
     else
-	neighbors[3] = SENTINEL_IMPASSABLE_CHUNK 
+	neighbors[3] = SENTINEL_IMPASSABLE_CHUNK
 	neighbors[5] = SENTINEL_IMPASSABLE_CHUNK
 	neighbors[8] = SENTINEL_IMPASSABLE_CHUNK
     end
-    
+
     xChunks = map[x]
     if xChunks then
         neighbors[2] = xChunks[chunkYRow1] or SENTINEL_IMPASSABLE_CHUNK
@@ -152,14 +155,14 @@ function mapUtils.getCardinalChunks(map, x, y)
 	neighbors[1] = SENTINEL_IMPASSABLE_CHUNK
 	neighbors[4] = SENTINEL_IMPASSABLE_CHUNK
     end
-    
+
     xChunks = map[x-CHUNK_SIZE]
     if xChunks then
 	neighbors[2] = xChunks[y] or SENTINEL_IMPASSABLE_CHUNK
     else
 	neighbors[2] = SENTINEL_IMPASSABLE_CHUNK
     end
-    
+
     xChunks = map[x+CHUNK_SIZE]
     if xChunks then
 	neighbors[3] = xChunks[y] or SENTINEL_IMPASSABLE_CHUNK
@@ -186,7 +189,7 @@ function mapUtils.positionFromDirectionAndChunk(direction, startPosition, endPos
 	endPosition.x = startPosition.x + CHUNK_SIZE * scaling
 	endPosition.y = startPosition.y
     elseif (direction == 6) then
-	endPosition.x = startPosition.x - CHUNK_SIZE * scaling 
+	endPosition.x = startPosition.x - CHUNK_SIZE * scaling
 	endPosition.y = startPosition.y + CHUNK_SIZE * scaling
     elseif (direction == 7) then
 	endPosition.x = startPosition.x
@@ -198,4 +201,5 @@ function mapUtils.positionFromDirectionAndChunk(direction, startPosition, endPos
     return endPosition
 end
 
+mapUtilsG = mapUtils
 return mapUtils
diff --git a/libs/MathUtils.lua b/libs/MathUtils.lua
index 62f0262..a277c32 100755
--- a/libs/MathUtils.lua
+++ b/libs/MathUtils.lua
@@ -1,3 +1,6 @@
+if mathUtilsG then
+    return mathUtilsG
+end
 local mathUtils = {}
 
 -- imports
@@ -8,7 +11,7 @@ local constants = require("Constants")
 
 local TICKS_A_MINUTE = constants.TICKS_A_MINUTE
 
-local INTERVAL_LOGIC = constants.INTERVAL_LOGIC 
+local INTERVAL_LOGIC = constants.INTERVAL_LOGIC
 
 -- imported functions
 
@@ -45,7 +48,7 @@ function mathUtils.xorRandom(state)
     local xor = bit32.bxor
     local lshift = bit32.lshift
     local rshift = bit32.rshift
-    
+
     state = state + 21594771
 
     return function()
@@ -66,9 +69,9 @@ end
 --]]
 function mathUtils.gaussianRandom(mean, std_dev)
     -- marsagliaPolarMethod
-    local iid1 
-    local iid2 
-    local q 
+    local iid1
+    local iid2
+    local q
     repeat
 	iid1 = 2 * mRandom() + -1
 	iid2 = 2 * mRandom() + -1
@@ -76,7 +79,7 @@ function mathUtils.gaussianRandom(mean, std_dev)
     until (q ~= 0) and (q < 1)
     local s = mSqrt((-2 * mLog10(q)) / q)
     local v = iid1 * s
-    
+
     return mean + (v * std_dev)
 end
 
@@ -86,9 +89,9 @@ function mathUtils.gaussianRandomRange(mean, std_dev, min, max)
     end
     local r
     repeat
-	local iid1 
-	local iid2 
-	local q 
+	local iid1
+	local iid2
+	local q
 	repeat
 	    iid1 = 2 * mRandom() + -1
 	    iid2 = 2 * mRandom() + -1
@@ -96,17 +99,17 @@ function mathUtils.gaussianRandomRange(mean, std_dev, min, max)
 	until (q ~= 0) and (q < 1)
 	local s = mSqrt((-2 * mLog10(q)) / q)
 	local v = iid1 * s
-	
+
 	r = mean + (v * std_dev)
     until (r >= min) and (r <= max)
     return r
 end
 
-function mathUtils.gaussianRandomRG(mean, std_dev, rg) 
+function mathUtils.gaussianRandomRG(mean, std_dev, rg)
     -- marsagliaPolarMethod
-    local iid1 
-    local iid2 
-    local q 
+    local iid1
+    local iid2
+    local q
     repeat
 	iid1 = 2 * rg() + -1
 	iid2 = 2 * rg() + -1
@@ -114,7 +117,7 @@ function mathUtils.gaussianRandomRG(mean, std_dev, rg)
     until (q ~= 0) and (q < 1)
     local s = mSqrt((-2 * mLog10(q)) / q)
     local v = iid1 * s
-    
+
     return mean + (v * std_dev)
 end
 
@@ -124,13 +127,13 @@ function mathUtils.gaussianRandomRangeRG(mean, std_dev, min, max, rg)
 	return min
     end
     repeat
-	local iid1 
-	local iid2 
-	local q 
+	local iid1
+	local iid2
+	local q
 	repeat
 	    iid1 = 2 * rg() + -1
 	    iid2 = 2 * rg() + -1
-	    q = (iid1 * iid1) + (iid2 * iid2)	    
+	    q = (iid1 * iid1) + (iid2 * iid2)
 	until (q ~= 0) and (q < 1)
 	local s = mSqrt((-2 * mLog10(q)) / q)
 	local v = iid1 * s
@@ -170,4 +173,5 @@ function mathUtils.distortPosition(position)
     position.y = position.y + (yDistort * 48)
 end
 
+mathUtilsG = mathUtils
 return mathUtils
diff --git a/libs/MovementUtils.lua b/libs/MovementUtils.lua
index b65e125..f75c19a 100755
--- a/libs/MovementUtils.lua
+++ b/libs/MovementUtils.lua
@@ -1,3 +1,6 @@
+if movementUtilsG then
+    return movementUtilsG
+end
 local movementUtils = {}
 
 -- imports
@@ -197,4 +200,5 @@ function movementUtils.scoreNeighborsForFormation(neighborChunks, validFunction,
     return highestChunk, highestDirection
 end
 
+movementUtilsG = movementUtils
 return movementUtils
diff --git a/libs/NEBaseUtils.lua b/libs/NEBaseUtils.lua
index 24f45c2..f0dcb59 100755
--- a/libs/NEBaseUtils.lua
+++ b/libs/NEBaseUtils.lua
@@ -1,3 +1,6 @@
+if neBaseUtilsG then
+    return neBaseUtilsG
+end
 local ne = {}
 
 -- imports
@@ -200,4 +203,5 @@ function ne.processNEUnitClass(natives, surface)
     end
 end
 
+neBaseUtilsG = ne
 return ne
diff --git a/libs/PheromoneUtils.lua b/libs/PheromoneUtils.lua
index 34da758..27793f0 100755
--- a/libs/PheromoneUtils.lua
+++ b/libs/PheromoneUtils.lua
@@ -1,3 +1,6 @@
+if pheromoneUtilsG then
+    return pheromoneUtilsG
+end
 local pheromoneUtils = {}
 
 -- imports
@@ -203,4 +206,5 @@ function pheromoneUtils.processPheromone(map, chunk, staging)
     end
 end
 
+pheromoneUtilsG = pheromoneUtils
 return pheromoneUtils
diff --git a/libs/PlayerUtils.lua b/libs/PlayerUtils.lua
index a9db283..f948208 100755
--- a/libs/PlayerUtils.lua
+++ b/libs/PlayerUtils.lua
@@ -1,3 +1,6 @@
+if playerUtilsG then
+    return playerUtilsG
+end
 local playerUtils = {}
 
 -- imports
@@ -25,4 +28,5 @@ function playerUtils.playersWithinProximityToPosition(players, position, distanc
     return false
 end
 
+playerUtilsG = playerUtils
 return playerUtils
diff --git a/libs/SquadAttack.lua b/libs/SquadAttack.lua
index b76d05f..cfc72f0 100755
--- a/libs/SquadAttack.lua
+++ b/libs/SquadAttack.lua
@@ -1,3 +1,6 @@
+if (squadAttackG) then
+    return squadAttackG
+end
 local squadAttack = {}
 
 -- imports
@@ -9,9 +12,6 @@ local playerUtils = require("PlayerUtils")
 local movementUtils = require("MovementUtils")
 local mathUtils = require("MathUtils")
 local chunkPropertyUtils = require("ChunkPropertyUtils")
-local chunkUtils = require("ChunkUtils")
-
---local chunkUtils = require("ChunkUtils")
 
 -- constants
 
@@ -80,7 +80,7 @@ local function scoreSiegeLocation(squad, neighborChunk)
     return settle - lookupMovementPenalty(squad, neighborChunk)
 end
 
-function squadAttack.scoreAttackLocation(natives, squad, neighborChunk)
+local function scoreAttackLocation(natives, squad, neighborChunk)
     local damage
 
     if (neighborChunk[MOVEMENT_PHEROMONE] >= 0) then
@@ -167,7 +167,7 @@ local function attackMove(map, attackPosition, attackCmd, squad, group, natives,
                                                                      natives,
 								     chunk,
 								     getNeighborChunks(map, x, y),
-								     squad.attackScoreFunction,
+								     squad.attackScoreFunction or scoreAttackLocation,
 								     squad)
 	if (chunk ~= SENTINEL_IMPASSABLE_CHUNK) then
 	    addSquadToChunk(map, chunk, squad)
@@ -260,7 +260,7 @@ function squadAttack.squadsBeginAttack(natives, players)
                 if squad.kamikaze and (mRandom() < (kamikazeThreshold * 0.75)) then
                     squad.attackScoreFunction = scoreAttackKamikazeLocation
                 else
-                    squad.attackScoreFunction = squadAttack.scoreAttackLocation
+                    squad.attackScoreFunction = scoreAttackLocation
                 end
 		squad.status = SQUAD_RAIDING
 	    end
@@ -268,4 +268,5 @@ function squadAttack.squadsBeginAttack(natives, players)
     end
 end
 
+squadAttackG = squadAttack
 return squadAttack
diff --git a/libs/SquadDefense.lua b/libs/SquadDefense.lua
index f765eec..213c94f 100755
--- a/libs/SquadDefense.lua
+++ b/libs/SquadDefense.lua
@@ -1,3 +1,6 @@
+if aiDefenseG then
+    return aiDefenseG
+end
 local aiDefense = {}
 
 -- imports
@@ -113,4 +116,5 @@ function aiDefense.retreatUnits(chunk, position, squad, map, surface, natives, t
     end
 end
 
+aiDefenseG = aiDefense
 return aiDefense
diff --git a/libs/StringUtils.lua b/libs/StringUtils.lua
index bbe5818..a8faecb 100755
--- a/libs/StringUtils.lua
+++ b/libs/StringUtils.lua
@@ -1,3 +1,6 @@
+if stringUtilsG then
+    return stringUtilsG
+end
 local stringUtils = {}
 
 local sFind = string.find
@@ -10,4 +13,5 @@ function stringUtils.isSpawnerEgg(str)
     return sFind(str, "spawner", -#"spawner")
 end
 
+stringUtilsG = stringUtils
 return stringUtils
diff --git a/libs/UnitGroupUtils.lua b/libs/UnitGroupUtils.lua
index b986b7d..f64d3e3 100755
--- a/libs/UnitGroupUtils.lua
+++ b/libs/UnitGroupUtils.lua
@@ -1,3 +1,6 @@
+if unitGroupUtilsG then
+    return unitGroupUtilsG
+end
 local unitGroupUtils = {}
 
 -- imports
@@ -305,4 +308,5 @@ function unitGroupUtils.regroupSquads(natives, map)
     end
 end
 
+unitGroupUtilsG = unitGroupUtils
 return unitGroupUtils
diff --git a/libs/UnitUtils.lua b/libs/UnitUtils.lua
index 213cf57..d612c58 100755
--- a/libs/UnitUtils.lua
+++ b/libs/UnitUtils.lua
@@ -1,3 +1,6 @@
+if (unitUtilsG) then
+    return unitUtilsG
+end
 local unitUtils = {}
 
 -- imports
@@ -50,4 +53,5 @@ function unitUtils.convertTypeToDrainCrystal(evolutionFactor, entity)
     end
 end
 
+unitUtilsG = unitUtils
 return unitUtils