Hi there.
For Linux users, before launching the game, you need to resize the "game/gui/BWLogoMenuWindow2.png" image.
The image being the window logo and measuring 4168x4167, the X11 graphics server doesn't like it at all.
To fix the inevitable crash when launching the game, I resized the image to 1000x1000.
That fixed the problem.
I have attached the resized image if you don't know or don't want to do it yourself.
Sancho1969, maybe this is a fix that you can integrate into your mod?
I will report the bug on the AlterWorld discord.