diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/view/windows/WindowImagePreview.java b/src/main/java/org/gcube/portlets/user/workspace/client/view/windows/WindowImagePreview.java
index 3ef447b..0e0033b 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/view/windows/WindowImagePreview.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/view/windows/WindowImagePreview.java
@@ -18,6 +18,7 @@ public class WindowImagePreview {
 		Image img = new Image(image.getThumbnailUrl());
 		img.setWidth(String.valueOf(image.getThumbnailWidth()));
 		img.setHeight(String.valueOf(image.getThumbnailHeight()));
+		log("Thumbnail URL: "+image.getThumbnailUrl());
 		window.add(new Image(image.getThumbnailUrl()));
 		window.show();
 	}
@@ -50,5 +51,9 @@ public class WindowImagePreview {
 		window.setAutoHeight(true);
 		window.setPosition(positionX, positionY);
 	}
+	
+	public static native void log(String msg) /*-{
+	  $console.log(msg);
+	}-*/;
 
 }
diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/DownloadServlet.java b/src/main/java/org/gcube/portlets/user/workspace/server/DownloadServlet.java
index 193e894..70b3f6a 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/DownloadServlet.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/DownloadServlet.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.workspace.server;
 
-import java.io.BufferedInputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
@@ -21,19 +20,15 @@ import javax.servlet.http.HttpSession;
 import org.apache.commons.io.FilenameUtils;
 import org.apache.commons.io.IOUtils;
 import org.apache.log4j.Logger;
-import org.gcube.common.homelibary.model.items.type.NodeProperty;
 import org.gcube.common.homelibrary.home.HomeLibrary;
 import org.gcube.common.homelibrary.home.exceptions.InternalErrorException;
 import org.gcube.common.homelibrary.home.workspace.Workspace;
 import org.gcube.common.homelibrary.home.workspace.WorkspaceFolder;
 import org.gcube.common.homelibrary.home.workspace.WorkspaceItem;
-import org.gcube.common.homelibrary.home.workspace.exceptions.ExternalResourceBrokenLinkException;
-import org.gcube.common.homelibrary.home.workspace.exceptions.ExternalResourcePluginNotFoundException;
 import org.gcube.common.homelibrary.home.workspace.exceptions.ItemNotFoundException;
 import org.gcube.common.homelibrary.home.workspace.folder.FolderItem;
 import org.gcube.common.homelibrary.home.workspace.folder.items.ExternalFile;
 import org.gcube.common.homelibrary.home.workspace.folder.items.ExternalImage;
-import org.gcube.common.homelibrary.home.workspace.folder.items.ExternalResourceLink;
 import org.gcube.common.homelibrary.home.workspace.folder.items.ExternalUrl;
 import org.gcube.common.homelibrary.home.workspace.folder.items.GCubeItem;
 import org.gcube.common.homelibrary.home.workspace.folder.items.Query;
@@ -526,9 +521,9 @@ public class DownloadServlet extends HttpServlet{
 
 
 					}
-					
-					case EXTERNAL_RESOURCE_LINK:{ //IT'S SAME OF EXTERNAL FILE
-						
+					/*COMMENT ACCORDING TO HL
+					case EXTERNAL_RESOURCE_LINK:{//IT'S SAME OF EXTERNAL FILE
+						 
 						try{
 							ExternalResourceLink externalResourceLink = (ExternalResourceLink) folderItem;
 							OutputStream out = resp.getOutputStream();
@@ -589,13 +584,10 @@ public class DownloadServlet extends HttpServlet{
 //							sendError(resp,HttpServletResponse.SC_INTERNAL_SERVER_ERROR +": Error during resource retrieving, plugin not found!: "+e.getMessage());
 							e.printStackTrace();
 						}
-						
-						
-						return;
 
+						return;
 						
-						
-					}
+					}*/
 				}
 
 			}
diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceBuilder.java b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceBuilder.java
index 3c16423..2da2c3d 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceBuilder.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceBuilder.java
@@ -83,6 +83,7 @@ import org.gcube.portlets.user.workspace.shared.accounting.GxtAccountingEntryTyp
 import org.gcube.portlets.user.workspace.shared.accounting.GxtAccountingField;
 import org.gcube.vomanagement.usermanagement.model.UserModel;
 
+import com.google.gwt.user.client.Random;
 import com.thoughtworks.xstream.XStream;
 
 
@@ -210,6 +211,8 @@ public class GWTWorkspaceBuilder {
 		sb.append(id);
 		sb.append("&type=");
 		sb.append(requestType.toString());
+		sb.append("&random=");
+		sb.append(Random.nextInt()+""+Random.nextInt()+""+Random.nextInt());
 		return sb.toString();
 	}