Black widget on notebook

[lorenzo-rovigatti]

Hello,

I'm trying to use nglview in a jupyter notebook but I always get a black widget instead of the structure I want to visualize. Strangely enough, If I use the mouse to rotate or zoom in or out (with the wheel) in the widget, the structure appears, and then disappears as I stop moving the mouse.

Here is a screenshot (taken with Firefox, but I get the same thing with Chromium):

and here is a screenshot taken while dragging the widget with the mouse:

I'm using the following version:

python -c 'import nglview; print(nglview.__version__)'
python -c 'import ipywidgets; print(ipywidgets.__version__)'
3.1.2
8.1.5

And here is the output of pip freeze: freeze.txt

[hainm]

This is noted and thanks for your report.