diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/ConstantsExplorer.java b/src/main/java/org/gcube/portlets/user/workspace/client/ConstantsExplorer.java
index 6a6df3d..04a522d 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/ConstantsExplorer.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/ConstantsExplorer.java
@@ -225,9 +225,10 @@ public static enum WS_UPLOAD_TYPE {File, Archive};
 	 */
 	public enum ViewSwitchType {Tree, SmartFolder, Messages};
 
-	//SERLVET ERROR
+	//SERLVET PARAMETERS
 	public static final String ERROR_ITEM_DOES_NOT_EXIST = "Item does not exist. It may have been deleted by another user";
 	public static final String VALIDATEITEM = "validateitem";
+	public static final String CONTEXT_ID = "contextID";
 	public static final String REDIRECTONERROR = "redirectonerror";
 
 	//UPLOAD SERVLET PARAMETERS
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/util/RequestBuilderWorkspaceValidateItem.java b/src/main/java/org/gcube/portlets/user/workspace/client/util/RequestBuilderWorkspaceValidateItem.java
index f08793f..4f023af 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/util/RequestBuilderWorkspaceValidateItem.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/util/RequestBuilderWorkspaceValidateItem.java
@@ -32,7 +32,7 @@ public class RequestBuilderWorkspaceValidateItem {
 	 */
 	protected static final int TIME_INFO_DISPLAY = 1500; //milliseconds
 	private AsyncCallback<WindowOpenParameter> callback;
-	private String parameters;
+	private String httpQueryString;
 
 	/**
 	 *
@@ -49,7 +49,7 @@ public class RequestBuilderWorkspaceValidateItem {
 
 		final NewBrowserWindow newBrowserWindow = NewBrowserWindow.open("", targetWindow, "");
 
-		this.parameters = params;
+		this.httpQueryString = params;
 
 		if(servletName==null)
 			return;
@@ -59,17 +59,21 @@ public class RequestBuilderWorkspaceValidateItem {
 		if(!servletName.contains("/"))
 			servletName+="/"+servletName;
 
-		if(parameters==null)
-			parameters = ConstantsExplorer.VALIDATEITEM+"=true";
+		if(httpQueryString==null)
+			httpQueryString = ConstantsExplorer.VALIDATEITEM+"=true";
 		else
-			parameters +="&"+ConstantsExplorer.VALIDATEITEM+"=true";
+			httpQueryString +="&"+ConstantsExplorer.VALIDATEITEM+"=true";
 
-		String urlRequest = servletName+"?"+parameters;
+		// Add hidden parameters
+		String currentContextId = GCubeClientContext.getCurrentContextId();
+		httpQueryString+="&"+ConstantsExplorer.CONTEXT_ID+"="+currentContextId;
+
+		String urlRequest = servletName+"?"+httpQueryString;
 
 		GWT.log("request builder for: "+urlRequest);
 
 		RequestBuilder requestBuilder = new RequestBuilder(method, urlRequest);
-		GCubeClientContext.injectContext(requestBuilder);
+		//requestBuilder = GCubeClientContext.injectContext(requestBuilder);
 		new InfoDisplayMessage("Download", "Requesting...", TIME_INFO_DISPLAY);
 		try {
 
@@ -95,7 +99,7 @@ public class RequestBuilderWorkspaceValidateItem {
 				    }else { //OK STATUS
 
 				    	if(callback!=null)
-				    		callback.onSuccess(new WindowOpenParameter(targetWindow, "", params, true, newBrowserWindow));
+				    		callback.onSuccess(new WindowOpenParameter(targetWindow, "", httpQueryString, true, newBrowserWindow));
 				    }
 			    }
 
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 c82a792..68d7f1a 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
@@ -67,24 +67,23 @@ public class DownloadServlet extends HttpServlet{
 		boolean viewContent =  req.getParameter("viewContent")==null?false:req.getParameter("viewContent").equals("true");
 		boolean isValidItem =  req.getParameter(ConstantsExplorer.VALIDATEITEM)==null?false:req.getParameter(ConstantsExplorer.VALIDATEITEM).equals("true");
 		boolean urlRedirectOnError = req.getParameter(ConstantsExplorer.REDIRECTONERROR)==null?false:req.getParameter(ConstantsExplorer.REDIRECTONERROR).equals("true");
+		String contextID = req.getParameter(ConstantsExplorer.CONTEXT_ID);
 
-
-		logger.trace("Input Params [id: "+itemId + ", viewContent: "+viewContent+", "+ConstantsExplorer.VALIDATEITEM +": " +isValidItem+", urlRedirectOnError:" +urlRedirectOnError+"]");
+		logger.debug("Input Params [id: "+itemId + ", viewContent: "+viewContent+", "+ConstantsExplorer.VALIDATEITEM +": " +isValidItem+", urlRedirectOnError:" +urlRedirectOnError+", contextID: "+contextID+"]");
 		if(itemId==null || itemId.isEmpty()){
 			sendError(resp,HttpServletResponse.SC_INTERNAL_SERVER_ERROR +": Item id is null");
 			return;
 		}
 
-		logger.trace("FILE DOWNLOAD REQUEST "+itemId);
+		logger.debug("FILE DOWNLOAD REQUEST "+itemId);
 		Workspace wa = null;
 		try {
 			//ADDED 13-01-2014 SESSION VALIDATION
 			if(WsUtil.isSessionExpired(req))
 				throw new SessionExpiredException();
 
-			PortalContext pContext = PortalContext.getConfiguration();
-			String currentScope = pContext.getCurrentScope(req);
-			logger.info("INJECTED Scope "+currentScope);
+			String currentScope= PortalContext.getConfiguration().getCurrentScope(contextID);
+			logger.info("For ContextID: "+contextID +", read scope from Portal Context: "+currentScope);
 			wa = WsUtil.getWorkspace(req, currentScope);
 		} catch (Exception e) {