I'm on linux. I'll see if I can reproduce the issue and then email the saves. There's no error code, just a black screen upon entering a mission in some circumstances which persists even if you load a save, and during which the game is unresponsive. I've only been able to avoid it by keeping backups and trying to pass time / go into other missions before re-attempting the seemingly bugged one. Loading the bugged save tends to result in the auto generated backup being replaced with one in the bugged black-screened mission and borking my playthroughs.
I noticed the issue when attempting to enter Noble house missions while deep in debt and with many debt collectors after me, even very early into the game. Once I paid off the debt the issue stopped occuring, I don't think I noticed it happen a single time after that, which makes me think it may be related. If it matters, I was only going on missions to noble houses (not sure if it happens in other areas) and whenever possible, would kidnap two people to harvest them for blood, set up the blood harvesting, then go on another noble house mission. Doing this from a new save caused the issue repeatedly even if I quit and restarted the game and made a new playthrough.
I've also had issues with the acid splash spell which I think just doesn't work at all. Most of the time that I cast it it just doesn't do damage to enemies, or does at most 1 even though I had the damage upgraded to 13, and then when enemies walk on the acid instead of taking damage the game throws up an error code. And I think non-human wizards are unable to be assigned to jobs like crystal gathering or research which human wizards can do for some reason, which makes them less worth hiring.