diff --git a/core/AppEng.java b/core/AppEng.java
index 5da22af3..67e698d8 100644
--- a/core/AppEng.java
+++ b/core/AppEng.java
@@ -6,6 +6,7 @@ import java.util.concurrent.TimeUnit;
 
 import appeng.api.config.TunnelType;
 import appeng.core.api.IIMCHandler;
+import appeng.core.api.imc.IMCBlackListSpatial;
 import appeng.core.api.imc.IMCGrinder;
 import appeng.core.api.imc.IMCMatterCannon;
 import appeng.core.api.imc.IMCP2PAttunement;
@@ -71,6 +72,7 @@ public class AppEng
 	public AppEng() {
 		instance = this;
 
+		IMCHandlers.put( "blacklist-block-spatial", new IMCBlackListSpatial() );
 		IMCHandlers.put( "whitelist-spatial", new IMCSpatial() );
 		IMCHandlers.put( "add-grindable", new IMCGrinder() );
 		IMCHandlers.put( "add-mattercannon-ammo", new IMCMatterCannon() );
diff --git a/core/Registration.java b/core/Registration.java
index 6e72e4a2..24c37295 100644
--- a/core/Registration.java
+++ b/core/Registration.java
@@ -647,6 +647,11 @@ public class Registration
 
 		IMovableRegistry mr = AEApi.instance().registries().moveable();
 
+		/**
+		 * You can't move bed rock.
+		 */
+		mr.blacklistBlock( net.minecraft.init.Blocks.bedrock );
+
 		/*
 		 * White List Vanilla...
 		 */
diff --git a/core/api/imc/IMCBlackListSpatial.java b/core/api/imc/IMCBlackListSpatial.java
new file mode 100644
index 00000000..e2e78e40
--- /dev/null
+++ b/core/api/imc/IMCBlackListSpatial.java
@@ -0,0 +1,32 @@
+package appeng.core.api.imc;
+
+import net.minecraft.block.Block;
+import net.minecraft.item.ItemStack;
+import appeng.api.AEApi;
+import appeng.core.AELog;
+import appeng.core.api.IIMCHandler;
+import cpw.mods.fml.common.event.FMLInterModComms.IMCMessage;
+
+public class IMCBlackListSpatial implements IIMCHandler
+{
+
+	@Override
+	public void post(IMCMessage m)
+	{
+
+		ItemStack is = m.getItemStackValue();
+		if ( is != null )
+		{
+			Block blk = Block.getBlockFromItem( is.getItem() );
+			if ( blk != null )
+			{
+				AEApi.instance().registries().moveable().blacklistBlock( blk );
+				return;
+			}
+		}
+
+		AELog.info( "Bad Block blacklisted by " + m.getSender() );
+
+	}
+
+}
diff --git a/core/features/registries/MovableTileRegistry.java b/core/features/registries/MovableTileRegistry.java
index 7f34b7b3..1bb5916f 100644
--- a/core/features/registries/MovableTileRegistry.java
+++ b/core/features/registries/MovableTileRegistry.java
@@ -1,8 +1,10 @@
 package appeng.core.features.registries;
 
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.LinkedList;
 
+import net.minecraft.block.Block;
 import net.minecraft.tileentity.TileEntity;
 import appeng.api.exceptions.AppEngException;
 import appeng.api.movable.IMovableHandler;
@@ -13,6 +15,8 @@ import appeng.spatial.DefaultSpatialHandler;
 public class MovableTileRegistry implements IMovableRegistry
 {
 
+	private HashSet<Block> blacklisted = new HashSet();
+
 	private HashMap<Class<? extends TileEntity>, IMovableHandler> Valid = new HashMap<Class<? extends TileEntity>, IMovableHandler>();
 	private LinkedList<Class<? extends TileEntity>> test = new LinkedList<Class<? extends TileEntity>>();
 	private LinkedList<IMovableHandler> handlers = new LinkedList<IMovableHandler>();
@@ -100,7 +104,8 @@ public class MovableTileRegistry implements IMovableRegistry
 
 		if ( c.getName().equals( TileEntity.class.getName() ) )
 		{
-			throw new RuntimeException( new AppEngException( "Someone tried to make all tiles movable, this is a clear violation of the purpose of the white list." ) );
+			throw new RuntimeException( new AppEngException(
+					"Someone tried to make all tiles movable, this is a clear violation of the purpose of the white list." ) );
 		}
 
 		test.add( c );
@@ -126,4 +131,15 @@ public class MovableTileRegistry implements IMovableRegistry
 		return dsh;
 	}
 
+	@Override
+	public void blacklistBlock(Block blk)
+	{
+		blacklisted.add( blk );
+	}
+
+	public boolean isBlacklisted(Block blk)
+	{
+		return blacklisted.contains( blk );
+	}
+
 }
diff --git a/spatial/CachedPlane.java b/spatial/CachedPlane.java
index 125c5d33..10c81f04 100644
--- a/spatial/CachedPlane.java
+++ b/spatial/CachedPlane.java
@@ -80,6 +80,10 @@ public class CachedPlane
 
 		public boolean dontSkip(int y)
 		{
+			ExtendedBlockStorage extendedblockstorage = storage[y >> 4];
+			if ( reg.isBlacklisted( extendedblockstorage.getBlockByExtId( x, y & 15, z ) ) )
+				return false;
+
 			return skipThese == null ? true : !skipThese.contains( y );
 		}
 
@@ -114,6 +118,7 @@ public class CachedPlane
 
 	World wrld;
 	Block matrixFrame = AEApi.instance().blocks().blockMatrixFrame.block();
+	IMovableRegistry reg = AEApi.instance().registries().moveable();
 
 	LinkedList<WorldCoord> updates = new LinkedList<WorldCoord>();
 
diff --git a/tile/grindstone/TileGrinder.java b/tile/grindstone/TileGrinder.java
index ea7fc93d..1702eb0f 100644
--- a/tile/grindstone/TileGrinder.java
+++ b/tile/grindstone/TileGrinder.java
@@ -35,6 +35,9 @@ public class TileGrinder extends AEBaseInvTile implements ICrankable
 
 	private void addItem(InventoryAdaptor sia, ItemStack output)
 	{
+		if ( output == null )
+			return;
+
 		ItemStack notAdded = sia.addItems( output );
 		if ( notAdded != null )
 		{