Cannot refresh or change visualization with O3DVisualizer or gui after window is opened

**Describe the bug**
I am trying to use the new gui implementation, as proposed in another issue:
`o3d.visualization.O3DVisualizer
o3d.visualization.gui
o3d.visualization.rendering`

However, I am unable to find a way to refresh the window with the new changes. I have tried all the ways of visualization in `python/gui` folder to make it work, but usually nothing happens, or it exits with no error, when I try to tweak the already displayed geometries. I have also used post_redraw(), but it does neither work.

More specifically, When running the example `examples/python/gui/draw.py` without any changes , the function `selections()` exits with `Process finished with exit code -1073740791 (0xC0000409)`, when clicking on "ICP Registration".

**Environment**

- Windows 10 x64
- Python 3.8
- Open3D version: 0.13.0