diff --git a/src/main/java/gregtech/GT_Mod.java b/src/main/java/gregtech/GT_Mod.java
index debca654..84c9c5fa 100644
--- a/src/main/java/gregtech/GT_Mod.java
+++ b/src/main/java/gregtech/GT_Mod.java
@@ -60,7 +60,8 @@ import java.util.regex.Pattern;
 
 @Mod(modid = "gregtech", name = "GregTech", version = "MC1710", useMetadata = false, dependencies = "required-after:IC2; after:Forestry; after:PFAAGeologica; after:Thaumcraft; after:Railcraft; after:appliedenergistics2; after:ThermalExpansion; after:TwilightForest; after:harvestcraft; after:magicalcrops; after:BuildCraft|Transport; after:BuildCraft|Silicon; after:BuildCraft|Factory; after:BuildCraft|Energy; after:BuildCraft|Core; after:BuildCraft|Builders; after:GalacticraftCore; after:GalacticraftMars; after:GalacticraftPlanets; after:ThermalExpansion|Transport; after:ThermalExpansion|Energy; after:ThermalExpansion|Factory; after:RedPowerCore; after:RedPowerBase; after:RedPowerMachine; after:RedPowerCompat; after:RedPowerWiring; after:RedPowerLogic; after:RedPowerLighting; after:RedPowerWorld; after:RedPowerControl; after:UndergroundBiomes;")
 public class GT_Mod implements IGT_Mod {
-    public static final int VERSION = 509;
+    public static final int VERSION = 509, SUBVERSION = 31;
+    public static final int TOTAL_VERSION = 1000 * VERSION + SUBVERSION;
     public static final int REQUIRED_IC2 = 624;
     @Mod.Instance("gregtech")
     public static GT_Mod instance;
diff --git a/src/main/java/gregtech/api/metatileentity/BaseMetaTileEntity.java b/src/main/java/gregtech/api/metatileentity/BaseMetaTileEntity.java
index 6a64c802..09cf8e2f 100644
--- a/src/main/java/gregtech/api/metatileentity/BaseMetaTileEntity.java
+++ b/src/main/java/gregtech/api/metatileentity/BaseMetaTileEntity.java
@@ -119,6 +119,7 @@ public class BaseMetaTileEntity extends BaseTileEntity implements IGregTechTileE
             aNBT.setBoolean("mInputDisabled", mInputDisabled);
             aNBT.setBoolean("mOutputDisabled", mOutputDisabled);
             aNBT.setTag("GT.CraftingComponents", mRecipeStuff);
+            aNBT.setInteger("nbtVersion", GT_Mod.TOTAL_VERSION);
         } catch (Throwable e) {
             GT_Log.err.println("Encountered CRITICAL ERROR while saving MetaTileEntity, the Chunk whould've been corrupted by now, but I prevented that. Please report immidietly to GregTech Intergalactical!!!");
             e.printStackTrace(GT_Log.err);
@@ -187,7 +188,8 @@ public class BaseMetaTileEntity extends BaseTileEntity implements IGregTechTileE
             mCoverData = aNBT.getIntArray("mCoverData");
             mSidedRedstone = aNBT.getByteArray("mRedstoneSided");
             mRecipeStuff = aNBT.getCompoundTag("GT.CraftingComponents");
-
+            int nbtVersion = aNBT.getInteger("nbtVersion");
+            
             if (mCoverData.length != 6) mCoverData = new int[]{0, 0, 0, 0, 0, 0};
             if (mCoverSides.length != 6) mCoverSides = new int[]{0, 0, 0, 0, 0, 0};
             if (mSidedRedstone.length != 6)
@@ -202,6 +204,7 @@ public class BaseMetaTileEntity extends BaseTileEntity implements IGregTechTileE
                 for (int i = 0; i < tItemList.tagCount(); i++) {
                     NBTTagCompound tTag = tItemList.getCompoundTagAt(i);
                     int tSlot = tTag.getInteger("IntSlot");
+                    tSlot = shiftInventoryIndex(tSlot, nbtVersion);
                     if (tSlot >= 0 && tSlot < mMetaTileEntity.getRealInventory().length) {
                         mMetaTileEntity.getRealInventory()[tSlot] = GT_Utility.loadItem(tTag);
                     }
@@ -1904,4 +1907,53 @@ public class BaseMetaTileEntity extends BaseTileEntity implements IGregTechTileE
     public void onEntityCollidedWithBlock(World aWorld, int aX, int aY, int aZ, Entity collider) {
         mMetaTileEntity.onEntityCollidedWithBlock(aWorld, aX, aY, aZ, collider);
     }
+    
+    /**
+     * Shifts the machine Inventory index according to the change in Input/Output Slots.
+     * This is NOT done automatically. If you want to change slot count for a machine this method needs to be adapted.
+     * @param slotIndex The original Inventory index
+     * @param nbtVersion The GregTech version in which the original Inventory Index was saved.
+     * @return The corrected Inventory index
+     */
+    private int shiftInventoryIndex(int slotIndex, int nbtVersion){
+    	int oldInputSize, newInputSize, oldOutputSize, newOutputSize;
+    	if (mID >= 211 && mID <= 218) {//Assembler
+    		if (nbtVersion < 509031) {
+    			oldInputSize = 2;
+    			oldOutputSize = 1;
+    		} else {
+    			return slotIndex;
+    		}
+    		newInputSize = 6;
+    		newOutputSize = 1;
+    	} else if (mID >= 421 && mID <= 428){//Chemical Reactor
+    		if (nbtVersion < 509031) {
+    			oldInputSize = 2;
+    			oldOutputSize = 1;
+    		} else {
+    			return slotIndex;
+    		}
+    		newInputSize = 2;
+    		newOutputSize = 2;
+    	} else if (mID >= 531 && mID <= 538) {//Distillery
+    		if (nbtVersion < 509031) {
+    			oldInputSize = 1;
+    			oldOutputSize = 0;
+    		} else {
+    			return slotIndex;
+    		}
+    		newInputSize = 1;
+    		newOutputSize = 1;
+    	} else {
+        	return slotIndex;    		
+    	}
+    	int indexShift = 0;
+    	if (slotIndex >= oldInputSize) {
+    		indexShift += newInputSize - oldInputSize;
+    	}    	
+    	if (slotIndex >= oldInputSize + oldOutputSize) {
+    		indexShift += newOutputSize - oldOutputSize;
+    	}
+    	return slotIndex + indexShift;
+    }
 }