Assuming that by "shells" you mean "shields", yes, Wezqu has it right.
Yes shields.
Already found the solution to the problem.
Thank you.
7. If you get black flags:
Go to Documents/Paradox Interactive/Crusader Kings II. In there, delete the folder called "gfx". After that, edit settings.txt.
Change the following settings to:
Code:
size=
{
x=1024
y=768
}
fullScreen=no
Now restart your game. If this helps, you can change back to fullscreen/nice resolution again, and the flags should be there.