diff --git a/rse/plugins/org.eclipse.dstore.core/src/org/eclipse/dstore/internal/core/client/ClientCommandHandler.java b/rse/plugins/org.eclipse.dstore.core/src/org/eclipse/dstore/internal/core/client/ClientCommandHandler.java
index 00d8481bb66..8071ae40c32 100644
--- a/rse/plugins/org.eclipse.dstore.core/src/org/eclipse/dstore/internal/core/client/ClientCommandHandler.java
+++ b/rse/plugins/org.eclipse.dstore.core/src/org/eclipse/dstore/internal/core/client/ClientCommandHandler.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2002, 2009 IBM Corporation and others.
+ * Copyright (c) 2002, 2010 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -15,11 +15,11 @@
  * David McKnight  (IBM)   [220123][dstore] Configurable timeout on irresponsiveness
  * David McKnight  (IBM)   [222168][dstore] Buffer in DataElement is not sent
  * David McKnight  (IBM)   [246826][dstore] KeepAlive does not work correctly
+ * David McKnight  (IBM)   [306853][dstore] RD/z client hang  after browse copy book command
  *******************************************************************************/
 
 package org.eclipse.dstore.internal.core.client;
-
-import org.eclipse.dstore.core.java.IRemoteClassInstance;
+
import org.eclipse.dstore.core.java.IRemoteClassInstance;
 import org.eclipse.dstore.core.model.CommandHandler;
 import org.eclipse.dstore.core.model.DE;
 import org.eclipse.dstore.core.model.DataElement;
@@ -28,6 +28,7 @@ import org.eclipse.dstore.core.model.DataStoreResources;
 import org.eclipse.dstore.internal.core.util.Sender;
 
 
+
 /**
  * The ClientCommandHandler is reponsible for maintaining
  * a queue of commands and periodically sending commands
@@ -225,7 +226,7 @@ public class ClientCommandHandler extends CommandHandler
 		while (_commands.size() > 0)
 		{
 			DataElement command = null;
-			//synchronized (_commands)
+			synchronized (_commands)
 			{
 				command = (DataElement)_commands.remove(0);
 			}