corner posts which are "black"

I'm posting this message here because I don't really know where my problem comes from (skin, adboard, 3d ???). 

So sorry if this message is incorrectly placed (I leave it to Mons, or another moderator to put it in the right place).

So my problem is that when I play in 3d mode, I have the corner posts which are "black". What could be the cause ?

Thank you in advance for your help.

Cordially

Salutations to all. 

So there, I do not understand anything ... 

I play today and my flags look correct ... (Are white with black lines ...) And I did absolutely nothing !!!

If anyone ever knows how to make it's flags become, say, with the main club color, any help is welcome !!!