vpython output is not rendering the shape

[M. A. Mohammadi]

Hi, 

I am using vpython to say draw a simple sphere and I do the following:

from vpython import *

sphere()

This opens a browser with a localhost address but in the page it is simply showing a black box with no sphere in it. I do the same in Jupyter on my windows 11 and no problem but on my raspverry pi 4B it's not working! any idea on how to get the shape show up in the black box? 

Appreciate any help,

Caspian