from procdump https://drive.google.com/file/d/19i9ls2LwWipdNMvYm0oyglAqZkAjGlAz/view?usp=sharing

Procdump dump is useful, but does not match your original report of stack overrun. It crashes while trying to check if it should clean up the MPMissionsCache folder, it crashes because something is wrong with the filepath.

I found these in the dump

LOCALAPPDATA=C:\Users\°íÁ¤¸ð\AppData\Local

C:\Users\고정모\AppData\Local\Arma 3\AnimDataCache\
C:\Users\고정모\AppData\Local\Arma 3\Arma3_x64_2026-08-29_22-11-40.rpt

That is a.... somewhat unusual username you have there. That is triggering the crashes.

Alright, creating a new windows account (with english characters) fixed the issue.

It was working prior to 2.22 with the same user, his username is "고정모"

Yeah normal Korean characters are supposed to work. But what I see in the dump just looks like corrupted garbage.
Thank you, I will try to reproduce with that name