diff --git a/mmdet3d/datasets/transforms/dbsampler.py b/mmdet3d/datasets/transforms/dbsampler.py
index 56e8440b74..093cdfb170 100644
--- a/mmdet3d/datasets/transforms/dbsampler.py
+++ b/mmdet3d/datasets/transforms/dbsampler.py
@@ -280,7 +280,7 @@ def sample_all(self,
                 s_points_list.append(s_points)
 
             gt_labels = np.array([self.cat2label[s['name']] for s in sampled],
-                                 dtype=np.long)
+                                 dtype=np.int64)
 
             if ground_plane is not None:
                 xyz = sampled_gt_bboxes[:, :3]
diff --git a/mmdet3d/visualization/local_visualizer.py b/mmdet3d/visualization/local_visualizer.py
index d1eff4af97..1bc63701a5 100644
--- a/mmdet3d/visualization/local_visualizer.py
+++ b/mmdet3d/visualization/local_visualizer.py
@@ -884,7 +884,7 @@ def show(self,
                     self.view_port = \
                         self.view_control.convert_to_pinhole_camera_parameters()  # noqa: E501
                 self.flag_next = False
-            self.o3d_vis.clear_geometries()
+            # self.o3d_vis.clear_geometries()
             try:
                 del self.pcd
             except (KeyError, AttributeError):
@@ -893,7 +893,7 @@ def show(self,
                 if not (save_path.endswith('.png')
                         or save_path.endswith('.jpg')):
                     save_path += '.png'
-                self.o3d_vis.capture_screen_image(save_path)
+                self.o3d_vis.capture_screen_image(save_path, do_render=True)
             if self.flag_exit:
                 self.o3d_vis.destroy_window()
                 self.o3d_vis.close()