broken portrait issues?

Hi there.

I face a lot of issues with somehow "broken" portraits.

a) Faces are missing (Hair and clothes there, but "faceless men" ahaha), crowns or other parts are deranged, characters are glassy-transparent or black-ish, parts of the portrait falling out of the frame, ... still the interaction per right-click works, it's just shitty aesthetics.

b) far more annoying, instead of portrait a wall or nothing, portrait shifted from frame, portrait oversized (like much bigger than the frame), and, NO interaction per right-click possible

restarting the game sometimes helps for a while, but the problem shows up again soon

Any ideas what might cause those problems or how to fix them?

I use the AGOT 2.1 version and the newest version of ck2. Is there a way to use an older version of ck2 which might be better compatible?

Thanks for help!