diff --git a/block/solids/BlockSkyStone.java b/block/solids/BlockSkyStone.java
index 42d2619f3..e9eb9edf3 100644
--- a/block/solids/BlockSkyStone.java
+++ b/block/solids/BlockSkyStone.java
@@ -21,6 +21,7 @@ import appeng.block.AEBaseBlock;
 import appeng.core.WorldSettings;
 import appeng.core.features.AEFeature;
 import appeng.helpers.LocationRotation;
+import appeng.helpers.NullRotation;
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
@@ -80,7 +81,7 @@ public class BlockSkyStone extends AEBaseBlock implements IOrientableBlock
 	{
 		if ( w.getBlockMetadata( x, y, z ) == 0 )
 			return new LocationRotation( w, x, y, z );
-		return null;
+		return new NullRotation();
 	}
 
 	@Override
diff --git a/client/render/WorldRender.java b/client/render/WorldRender.java
index 0c90efd3c..671a7d1d5 100644
--- a/client/render/WorldRender.java
+++ b/client/render/WorldRender.java
@@ -21,6 +21,7 @@ public class WorldRender implements ISimpleBlockRenderingHandler
 	private RenderBlocks renderer = new RenderBlocks();
 	final int renderID = RenderingRegistry.getNextAvailableRenderId();
 	public static final WorldRender instance = new WorldRender();
+	boolean hasErrored = false;
 
 	public HashMap<AEBaseBlock, BaseBlockRender> blockRenders = new HashMap();
 
@@ -72,7 +73,13 @@ public class WorldRender implements ISimpleBlockRenderingHandler
 		}
 		else
 		{
-			AELog.severe( "Invalid render: " + item.getUnlocalizedName() + " as ae block" );
+			if ( !hasErrored )
+			{
+				hasErrored = true;
+				AELog.severe( "Invalid render - item/block mismatch" );
+				AELog.severe( "		item: " + item.getUnlocalizedName() );
+				AELog.severe( "		block: " + blk.getUnlocalizedName() );
+			}
 		}
 	}
 
diff --git a/helpers/NullRotation.java b/helpers/NullRotation.java
new file mode 100644
index 000000000..8a8a06074
--- /dev/null
+++ b/helpers/NullRotation.java
@@ -0,0 +1,36 @@
+package appeng.helpers;
+
+import net.minecraftforge.common.util.ForgeDirection;
+import appeng.api.util.IOrientable;
+
+public class NullRotation implements IOrientable
+{
+
+	public NullRotation() {
+
+	}
+
+	@Override
+	public void setOrientation(ForgeDirection Forward, ForgeDirection Up)
+	{
+
+	}
+
+	@Override
+	public ForgeDirection getUp()
+	{
+		return ForgeDirection.UP;
+	}
+
+	@Override
+	public ForgeDirection getForward()
+	{
+		return ForgeDirection.SOUTH;
+	}
+
+	@Override
+	public boolean canBeRotated()
+	{
+		return false;
+	}
+}
diff --git a/util/item/AEItemStack.java b/util/item/AEItemStack.java
index 032085399..5044eaf72 100644
--- a/util/item/AEItemStack.java
+++ b/util/item/AEItemStack.java
@@ -497,7 +497,7 @@ public final class AEItemStack extends AEStack<IAEItemStack> implements IAEItemS
 		if ( newDef.item.isDamageable() )
 			newDef.damageValue = newDef.dspDamage;
 
-		newDef.tagCompound = newDef.lowTag;
+		newDef.tagCompound = AEItemDef.lowTag;
 		newDef.reHash();
 		return bottom;
 	}
@@ -527,7 +527,7 @@ public final class AEItemStack extends AEStack<IAEItemStack> implements IAEItemS
 		if ( newDef.item.isDamageable() )
 			newDef.damageValue = top.def.dspDamage;
 
-		newDef.tagCompound = newDef.highTag;
+		newDef.tagCompound = AEItemDef.highTag;
 		newDef.reHash();
 		return top;
 	}