I've filled a shape with a gradient but on screen, it's like there was nothing. I've changed gradient, color, it stays without color.
BUT, if I copy/paste in another document, it's ok.
So, back to my original document and copy it and it's ok but it's very annoying.
With another shape, moving it and the filled color has vanished but it was ok before. I had to do the same operation (copy/paste in another document).