floweaver does not even the basic project sankeys from tutorials

[AlexejP]

Hi Rick Lupton, Hi to All,

after installing the packages via conda pip and downloading the code of the basic tutorial 'quickstart', I tried to run it. So far not errors are shown in my jupyter notebook, but no sankeys are show as well.
Because there is also no error on the issue, it is difficult to search for the issue (which I tried unsuccessfully).

As you see, no sankey is shown/projected in the output.

floweaver is installed:

Many thanks
Alexej