diff --git a/src/main/java/appeng/items/contents/NetworkToolViewer.java b/src/main/java/appeng/items/contents/NetworkToolViewer.java
index cdae02d4..79a0fa62 100644
--- a/src/main/java/appeng/items/contents/NetworkToolViewer.java
+++ b/src/main/java/appeng/items/contents/NetworkToolViewer.java
@@ -54,13 +54,12 @@ public class NetworkToolViewer implements INetworkTool, IAEAppEngInventory
 	@Override
 	public void saveChanges()
 	{
-		this.inv.markDirty( -1 );
+		this.inv.writeToNBT( Platform.openNbtData( this.is ), "inv" );
 	}
 
 	@Override
 	public void onChangeInventory( IItemHandler inv, int slot, InvOperation mc, ItemStack removedStack, ItemStack newStack )
 	{
-		this.inv.writeToNBT( Platform.openNbtData( this.is ), "inv" );
 	}
 
 	@Override
diff --git a/src/main/java/appeng/tile/inventory/AppEngInternalAEInventory.java b/src/main/java/appeng/tile/inventory/AppEngInternalAEInventory.java
index 4b67ca09..95fe51e8 100644
--- a/src/main/java/appeng/tile/inventory/AppEngInternalAEInventory.java
+++ b/src/main/java/appeng/tile/inventory/AppEngInternalAEInventory.java
@@ -46,6 +46,7 @@ public class AppEngInternalAEInventory implements IInternalItemHandler, Iterable
 	private final IAEItemStack[] inv;
 	private final int size;
 	private int maxStack;
+	private boolean dirtyFlag = false;
 
 	public AppEngInternalAEInventory( final IAEAppEngInventory te, final int s )
 	{
@@ -252,8 +253,10 @@ public class AppEngInternalAEInventory implements IInternalItemHandler, Iterable
 	{
 		if( this.te != null && Platform.isServer() )
 		{
+			this.dirtyFlag = true;
 			this.te.onChangeInventory( this, slot, op, removed, inserted );
 			this.te.saveChanges();
+			this.dirtyFlag = false;
 		}
 	}
 
@@ -283,6 +286,9 @@ public class AppEngInternalAEInventory implements IInternalItemHandler, Iterable
 	@Override
 	public void markDirty( int slot )
 	{
-		this.fireOnChangeInventory( slot, InvOperation.DIRTY, ItemStack.EMPTY, ItemStack.EMPTY );
+		if( !this.dirtyFlag )
+		{
+			this.fireOnChangeInventory( slot, InvOperation.DIRTY, ItemStack.EMPTY, ItemStack.EMPTY );
+		}
 	}
 }
diff --git a/src/main/java/appeng/tile/inventory/AppEngInternalInventory.java b/src/main/java/appeng/tile/inventory/AppEngInternalInventory.java
index 1ee707ca..d7add405 100644
--- a/src/main/java/appeng/tile/inventory/AppEngInternalInventory.java
+++ b/src/main/java/appeng/tile/inventory/AppEngInternalInventory.java
@@ -43,6 +43,7 @@ public class AppEngInternalInventory extends ItemStackHandler implements IIntern
 	private final int[] maxStack;
 	private ItemStack previousStack = ItemStack.EMPTY;
 	private IAEItemFilter filter;
+	private boolean dirtyFlag = false;
 
 	public AppEngInternalInventory( final IAEAppEngInventory inventory, final int size, final int maxStack, IAEItemFilter filter )
 	{
@@ -118,6 +119,7 @@ public class AppEngInternalInventory extends ItemStackHandler implements IIntern
 	{
 		if( this.getTileEntity() != null && this.eventsEnabled() )
 		{
+			this.dirtyFlag = true;
 			ItemStack newStack = this.getStackInSlot( slot ).copy();
 			ItemStack oldStack = this.previousStack;
 			InvOperation op = InvOperation.SET;
@@ -141,6 +143,7 @@ public class AppEngInternalInventory extends ItemStackHandler implements IIntern
 			this.getTileEntity().onChangeInventory( this, slot, op, oldStack, newStack );
 			this.getTileEntity().saveChanges();
 			this.previousStack = ItemStack.EMPTY;
+			this.dirtyFlag = false;
 		}
 		super.onContentsChanged( slot );
 	}
@@ -158,10 +161,12 @@ public class AppEngInternalInventory extends ItemStackHandler implements IIntern
 	@Override
 	public void markDirty( final int slot )
 	{
-		if( this.getTileEntity() != null && this.eventsEnabled() )
+		if( this.getTileEntity() != null && this.eventsEnabled() && !this.dirtyFlag )
 		{
+			this.dirtyFlag = true;
 			this.getTileEntity().onChangeInventory( this, slot, InvOperation.DIRTY, ItemStack.EMPTY, ItemStack.EMPTY );
 			this.getTileEntity().saveChanges();
+			this.dirtyFlag = false;
 		}
 	}