Instead, after 10 consecutive tries (10! ) I finally reproduced one crash, so I added some security checks in battle screen rendering procedure to avoid such crash.
I really appreciate you taking the effort to assist me, many thanks.
Tried checking the Load all sounds at start
box in the config file and, using the save I sent you, have now made it into May 1915 which represents the farthest have managed to get so far. Again am not sure if this is coincidental or causal or if it provides an actual fix. If causal it might point to a sound issue but since I noticed no significant performance difference (other than the lack of noise) with sound on or off, I'm not sure.
I'm leaning towards exiting and restarting after every second turn, saving at the end of the military phase and only attempting no more than one or two resolution phases per session.