diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 0bbcb61bf..faeb688c3 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -3343,7 +3343,7 @@ void read_binary_stl(const std::string& filename, std::string& model_id, std::st
 
         char protocol_version[3] = { data[3], data[4], data[5] };
 
-        //version 
+        //version
         if (protocol_version[0] != '1' || protocol_version[1] != '.' || protocol_version[2] != '0') {
             file.close();
             return;
@@ -4051,10 +4051,11 @@ std::vector<size_t> Plater::priv::load_files(const std::vector<fs::path>& input_
                 q->model().load_from(model);
                 load_auxiliary_files();
             }
+            BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ":" << __LINE__ << boost::format(", before load_model_objects, count %1%")%model.objects.size();
             auto loaded_idxs = load_model_objects(model.objects, is_project_file);
             obj_idxs.insert(obj_idxs.end(), loaded_idxs.begin(), loaded_idxs.end());
 
-            BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ":" << __LINE__ << boost::format("import 3mf IMPORT_LOAD_MODEL_OBJECTS \n");
+            BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ":" << __LINE__ << boost::format(", finished load_model_objects");
             wxString msg = wxString::Format(_L("Loading file: %s"), from_path(real_filename));
             dlg_cont     = dlg.Update(progress_percent, msg);
             if (!dlg_cont) {
@@ -4066,7 +4067,7 @@ std::vector<size_t> Plater::priv::load_files(const std::vector<fs::path>& input_
             for (const ModelObject *model_object : model.objects) {
                 new_model->add_object(*model_object);
 
-                BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ":" << __LINE__ << boost::format("import 3mf IMPORT_ADD_MODEL_OBJECTS \n");
+                BOOST_LOG_TRIVIAL(debug) << __FUNCTION__ << ":" << __LINE__ << boost::format(", added object %1%")%model_object->name;
                 wxString msg = wxString::Format(_L("Loading file: %s"), from_path(real_filename));
                 dlg_cont     = dlg.Update(progress_percent, msg);
                 if (!dlg_cont) {
@@ -4301,6 +4302,7 @@ std::vector<size_t> Plater::priv::load_model_objects(const ModelObjectPtrs& mode
         }
     }
 
+    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ":" << __LINE__ << boost::format(", loaded objects, begin to auto placement");
 #ifdef AUTOPLACEMENT_ON_LOAD
 #if 0
     // FIXME distance should be a config value /////////////////////////////////
@@ -4345,9 +4347,19 @@ std::vector<size_t> Plater::priv::load_model_objects(const ModelObjectPtrs& mode
     //        _L("Object too large?"));
     //}
 
+    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ":" << __LINE__ << boost::format(", finished auto placement, before add_objects_to_list");
     notification_manager->close_notification_of_type(NotificationType::UpdatedItemsInfo);
-    wxGetApp().obj_list()->add_objects_to_list(obj_idxs);
 
+    if (obj_idxs.size() > 1) {
+        std::vector<size_t> obj_idxs_1 (obj_idxs.begin(), obj_idxs.end() - 1);
+
+        wxGetApp().obj_list()->add_objects_to_list(obj_idxs_1, false);
+        wxGetApp().obj_list()->add_object_to_list(obj_idxs[obj_idxs.size() - 1]);
+    }
+    else
+        wxGetApp().obj_list()->add_objects_to_list(obj_idxs);
+
+    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ":" << __LINE__ << boost::format(", after add_objects_to_list");
     update();
     // Update InfoItems in ObjectList after update() to use of a correct value of the GLCanvas3D::is_sinking(),
     // which is updated after a view3D->reload_scene(false, flags & (unsigned int)UpdateParams::FORCE_FULL_SCREEN_REFRESH) call
@@ -4381,7 +4393,7 @@ fs::path Plater::priv::get_export_file_path(GUI::FileType file_type)
         // for 3mf take the path from the project filename, if any
         output_file = into_path(get_project_filename(".3mf"));
     else if (file_type == FT_STL) {
-        if (obj_idx > 0 && obj_idx < this->model.objects.size() && selection.is_single_full_object()) { 
+        if (obj_idx > 0 && obj_idx < this->model.objects.size() && selection.is_single_full_object()) {
             output_file = this->model.objects[obj_idx]->get_export_filename();
         }
         else {