Dedas, Edi, I won't interfere in your conversation. Really. No way.
Well, I've just tested: unisntall Catalyst 8.12, a little Ccleaner on my registry base (I hope this is a good tool, because I entirely trusted it in the fixes it proposed to me ...

), and the reboot in VGA & installation of Catalyst 9.2.
It doesn't work. Same issue: corrupted display. I've got a screen capture of the Dom3 begin screen and it's ugly, look for yourself 'see attached file - sory, I don't know how to insert image directly from my computer ; it seems you can't).
So, I uninstall Catalyst 9.2, a little VGA screen and reinstall 8.12.
I will now rearrange my desktop icons, gathered in a messy way after VGA state between to drivers install (that's why I HATE uninstall GC Drivers

)
I stay sure that it is an driver issue with my specific GC model. Bah, I will live with it for now.
EDIT: Edi, I only install recently some DirectX Windows games, so it's not supposed to interfere ... But who knows?
By the way, this is the first time I've got this kind of problem. I have experienced some battlefield display problems after new drivers (especially massive slowdown when heavy graphics), but not this kind of thing.
It makes me think that I continue to have some weird battle display, since I got Dom3 (and with differents GC): this is always in some particular area (i.e. some specific battlegrounds, always the sames): particules effects (like heat or cold surrounding, or flames or explosions) aren't completly displayed and the background don't refresh so if you move the camera, the image stack on itself.