From: Zagreb, Croatia
That did it! Renamed the sound folder (disabling sounds in the game), and i'm now able to save/end turns. Restarted the game twice and still no problems.
It looks like famous conflict with installed codecs and filters.
Have you, perhaps, installed some kind of "Codec Pack" onto your PC "Jajusha"?
Installed "K-Lite codec pack" in March this year. I can try to unistall and/or update it and report on it if it helps debugging this.
All such "Codec Packs" have tendency to do more harm than good in some cases... I prefer and recommend individual codec installation...
Prior Preparation & Planning Prevents Pathetically Poor Performance!
A & B: WitW, WitE, WbtS, GGWaW, GGWaW2-AWD, HttR, CotA, BftB, CF
P: UV, WitP, WitP-AE