Thank you, MareroQ, for finding that part that will not work and for alerting us. I checked several of the shapes but must not have checked "moon". I never really had an occasion to use it before.

@ MareoQ, for me the problem wasn't solved either.
My solution was to keep using the path shape creator in Gimp 2.8 and finish my work in Gimp 2.10.
I wrote that in post 9 viewtopic.php?f=9&t=17044
That's why I considered my problem been solved (for the time being.)

I'm very happy with the download of Noone.
Although the shape moon doesn't work for me either. I've plenty of choice between the others.
And I thanked Noone on the Gimp Learn forum and you for the edited download

I am not a coder (especially gtk) but after the second attempt - Moon it's working fine now.
There is also translation into other languages (if it was developed for version 8 - in the "Locales" version only translation PL and ES)

Thanks MareroQ!

By any chance... is there a way to make the list font white on dark instead of dark on white?
So it would fit better with the dark style ( and it's less glaring for old eyes).
Tried to find where they define the colours but no success.

I played around with this and it is cool. But let me just say that Pixelitor 4.30 is the best open source program for making shapes. It has true vector layers as well.