diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/GeoportalDataViewerConstants.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/GeoportalDataViewerConstants.java
index d50a288..5393d96 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/GeoportalDataViewerConstants.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/GeoportalDataViewerConstants.java
@@ -19,8 +19,8 @@ public class GeoportalDataViewerConstants {
 	//Geoportal_Exporter_ACTION_SERVLET
 	public static final String UCD_ID_PARAMETER = "ucdID";
 	public static final String PROIECT_ID_PARAMETER = "projectID";
-	public static final String CONTEXT_ID_PARAMETER = "contex_id";
-	public static final String USER_ID_PARAMETER = "user_id";
+	public static final String CONTEXT_ID_PARAMETER = "c_id";
+	public static final String USER_ID_PARAMETER = "u_id";
 	public static final String GEOPORTAL_EXPORT_ACTION_SERVLET = GWT.getModuleBaseURL()
 			+ "geoportalexporterservice";
 
diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/cms/project/ProjectViewer.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/cms/project/ProjectViewer.java
index 12e8304..c582248 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/cms/project/ProjectViewer.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/cms/project/ProjectViewer.java
@@ -15,7 +15,6 @@ import org.gcube.portlets.user.geoportaldataviewer.client.events.AddLayerToMapEv
 import org.gcube.portlets.user.geoportaldataviewer.client.events.TimelineProjectRelationsEvent;
 import org.gcube.portlets.user.geoportaldataviewer.client.events.TimelineProjectRelationsEvent.EVENT_TYPE;
 import org.gcube.portlets.user.geoportaldataviewer.client.gis.MapUtils;
-import org.gcube.portlets.user.geoportaldataviewer.client.resources.GeoportalImages;
 import org.gcube.portlets.user.geoportaldataviewer.client.ui.ModalWindow;
 import org.gcube.portlets.user.geoportaldataviewer.client.ui.dialogs.DialogShareableLink;
 import org.gcube.portlets.user.geoportaldataviewer.client.ui.map.ExtentMapUtil;
@@ -25,7 +24,6 @@ import org.gcube.portlets.user.geoportaldataviewer.client.ui.map.MapView;
 import org.gcube.portlets.user.geoportaldataviewer.client.util.NewBrowserWindow;
 
 import com.github.gwtbootstrap.client.ui.Button;
-import com.github.gwtbootstrap.client.ui.Modal;
 import com.github.gwtbootstrap.client.ui.constants.ButtonType;
 import com.github.gwtbootstrap.client.ui.constants.IconType;
 import com.google.gwt.core.client.GWT;
@@ -33,22 +31,14 @@ import com.google.gwt.dom.client.UListElement;
 import com.google.gwt.event.dom.client.ClickEvent;
 import com.google.gwt.event.dom.client.ClickHandler;
 import com.google.gwt.event.shared.HandlerManager;
-import com.google.gwt.http.client.Request;
-import com.google.gwt.http.client.RequestBuilder;
-import com.google.gwt.http.client.RequestBuilder.Method;
-import com.google.gwt.http.client.RequestCallback;
-import com.google.gwt.http.client.RequestException;
-import com.google.gwt.http.client.Response;
 import com.google.gwt.uibinder.client.UiBinder;
 import com.google.gwt.uibinder.client.UiField;
 import com.google.gwt.user.client.Random;
 import com.google.gwt.user.client.Window;
 import com.google.gwt.user.client.rpc.AsyncCallback;
 import com.google.gwt.user.client.ui.Composite;
-import com.google.gwt.user.client.ui.FlowPanel;
 import com.google.gwt.user.client.ui.HTML;
 import com.google.gwt.user.client.ui.HTMLPanel;
-import com.google.gwt.user.client.ui.Image;
 import com.google.gwt.user.client.ui.Widget;
 
 import ol.Coordinate;
@@ -162,7 +152,7 @@ public class ProjectViewer extends Composite {
 			@Override
 			public void onSuccess(Boolean result) {
 				GWT.log("Export as PDF visible: " + result);
-				exportButton.setVisible(result);
+				exportButton.setEnabled(result);
 
 			}
 		});
@@ -217,7 +207,7 @@ public class ProjectViewer extends Composite {
 		exportButton.setType(ButtonType.LINK);
 		exportButton.setIcon(IconType.FILE);
 		exportButton.setTitle("Export as PDF");
-		exportButton.setVisible(false);
+		exportButton.setEnabled(false);
 
 		exportButton.addClickHandler(new ClickHandler() {