No xgrid displayed in Fedora Linux

Specific domains Graphics and plotting
1

Hi,
after installation of Scilab 2025 under Fedora 40 I notice that it does not display a grid on screen or in bitmap exports.

This simple example

x=[0:0.1:2*%pi]';
plot2d(sin(x))
xgrid()
  1. has NO grid on screen
  2. has NO grid if exported to e.g. png
  3. HAS a grid when exported to pdf

I noticed this already in older versions of Scilab (always using Fedora).

Does anybody have an idea where to look for clue?

Thank you,
Thomas