diff --git a/Polyhedron/demo/Polyhedron/MainWindow.cpp b/Polyhedron/demo/Polyhedron/MainWindow.cpp
index 9aa515dd643..b91b64069fd 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.cpp
+++ b/Polyhedron/demo/Polyhedron/MainWindow.cpp
@@ -451,7 +451,7 @@ void filterMenuOperations(QMenu* menu, QString filter, bool keep_from_here)
         action->setVisible(!(submenu->isEmpty()));
 
       }
-      else if(action->text().contains(filter, Qt::CaseInsensitive)){
+      else if(action->text().remove("&").contains(filter, Qt::CaseInsensitive)){
         //menu->addAction(action);
         addActionToMenu(action, menu);
       }
@@ -491,7 +491,7 @@ void MainWindow::filterOperations(bool)
   Q_FOREACH(const PluginNamePair& p, plugins) {
     Q_FOREACH(QAction* action, p.first->actions()) {
       action->setVisible( p.first->applicable(action)
-                          && (action->text().contains(filter, Qt::CaseInsensitive)
+                          && (action->text().remove("&").contains(filter, Qt::CaseInsensitive)
                               || action->property("subMenuName")
                               .toString().contains(filter, Qt::CaseInsensitive)));
     }
@@ -1197,6 +1197,10 @@ void MainWindow::open(QString filename)
           selected_items << io_plugin->name();
       }
     }
+    //if no plugin is correct, offer them all.
+    for(CGAL::Three::Polyhedron_demo_io_plugin_interface* io_plugin : io_plugins) {
+        all_items << io_plugin->name();
+    }
   }
   else
     selected_items << *dfs_it;
@@ -1804,7 +1808,12 @@ void MainWindow::readSettings()
     viewer->setFastDrawing(settings.value("quick_camera_mode", true).toBool());
     scene->enableVisibilityRecentering(settings.value("offset_update", false).toBool());
     viewer->textRenderer()->setMax(settings.value("max_text_items", 10000).toInt());
-    viewer->setTotalPass(settings.value("transparency_pass_number", 4).toInt());
+    int val  = settings.value("transparency_pass_number", 4).toInt();
+    if (val < 4 ) {
+      val = 4;
+      settings.setValue("transparency_pass_number", 4);
+    }
+    viewer->setTotalPass(val);
     CGAL::Three::Three::s_defaultSMRM = CGAL::Three::Three::modeFromName(
           settings.value("default_sm_rm", "flat+edges").toString());
     CGAL::Three::Three::s_defaultPSRM = CGAL::Three::Three::modeFromName(
@@ -3173,9 +3182,9 @@ void SubViewer::lookat()
     if (viewer->camera()->frame()->isSpinning())
       viewer->camera()->frame()->stopSpinning();
     mw->viewerShow(viewer,
-                   (float)dialog.get_x(),
-                   (float)dialog.get_y(),
-                   (float)dialog.get_z());
+                   (float)dialog.get_x() + viewer->offset().x,
+                   (float)dialog.get_y() + viewer->offset().y,
+                   (float)dialog.get_z() + viewer->offset().z);
   }
 }
 
diff --git a/Polyhedron/demo/Polyhedron/Plugins/Operations_on_polyhedra/Clip_polyhedron_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/Operations_on_polyhedra/Clip_polyhedron_plugin.cpp
index 1585e3c0fad..4750f6ef4a5 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/Operations_on_polyhedra/Clip_polyhedron_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/Operations_on_polyhedra/Clip_polyhedron_plugin.cpp
@@ -91,7 +91,8 @@ public :
     //get the references
     this->scene = scene_interface;
     this->messages = mi;
-    plane = NULL;
+    plane = nullptr;
+    clipper_item = nullptr;
     //creates and link the actions
     actionClipPolyhedra = new QAction("Clip Polyhedra With Plane", mw);
     actionClipPolyhedra->setProperty("subMenuName","Polygon Mesh Processing/Corefinement");
diff --git a/Polyhedron/demo/Polyhedron/Plugins/Surface_mesh_deformation/Scene_edit_polyhedron_item.cpp b/Polyhedron/demo/Polyhedron/Plugins/Surface_mesh_deformation/Scene_edit_polyhedron_item.cpp
index 5ecf47e0f86..495d2b73342 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/Surface_mesh_deformation/Scene_edit_polyhedron_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/Surface_mesh_deformation/Scene_edit_polyhedron_item.cpp
@@ -905,6 +905,8 @@ bool Scene_edit_polyhedron_item::eventFilter(QObject* /*target*/, QEvent *event)
   // check state changes between old and current state
   bool ctrl_pressed_now = d->state.ctrl_pressing && !old_state.ctrl_pressing;
   bool ctrl_released_now = !d->state.ctrl_pressing && old_state.ctrl_pressing;
+  if(ctrl_released_now) //to avoid moving the control vertices next time ctrl is pressed
+    d->state.left_button_pressing = false;
   if(ctrl_pressed_now || ctrl_released_now || event->type() == QEvent::HoverMove)
   {// activate a handle manipulated frame
     CGAL::QGLViewer* viewer = Three::mainViewer();
diff --git a/Polyhedron/demo/Polyhedron/Scene.cpp b/Polyhedron/demo/Polyhedron/Scene.cpp
index 05998239946..5425285d9ed 100644
--- a/Polyhedron/demo/Polyhedron/Scene.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene.cpp
@@ -84,9 +84,12 @@ Scene::addItem(CGAL::Three::Scene_item* item)
         addGroup(group);
     //init the item for the mainViewer to avoid using unexisting 
     //VAOs if the mainViewer is not the first to be drawn.
+    QOpenGLFramebufferObject* fbo = CGAL::Three::Three::mainViewer()->depthPeelingFbo();
+    CGAL::Three::Three::mainViewer()->setDepthPeelingFbo(nullptr);//to prevent crashing as the fbo is not initialized in this call.
     item->draw(CGAL::Three::Three::mainViewer());
     item->drawEdges(CGAL::Three::Three::mainViewer());
     item->drawPoints(CGAL::Three::Three::mainViewer());
+    CGAL::Three::Three::mainViewer()->setDepthPeelingFbo(fbo);
     return id;
 }
 
diff --git a/Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp b/Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp
index a25bd48cadf..7b6febf0ff9 100644
--- a/Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp
@@ -102,7 +102,10 @@ struct Scene_surface_mesh_item_priv{
   Scene_surface_mesh_item_priv(const Scene_surface_mesh_item& other, Scene_surface_mesh_item* parent):
     smesh_(new SMesh(*other.d->smesh_)),
     idx_data_(other.d->idx_data_),
-    idx_edge_data_(other.d->idx_edge_data_)
+    idx_edge_data_(other.d->idx_edge_data_),
+    fpatch_id_map(other.d->fpatch_id_map),
+    min_patch_id(other.d->min_patch_id),
+    colors_(other.d->colors_)
   {
     item = parent;
     item->setTriangleContainer(1, new Triangle_container(VI::PROGRAM_WITH_LIGHT,