10 days ago - AndrewT - Direct link
Unfortunately as mods are involved we can't post this in Bug Reports.

I assume they must be cosmetic mods only, otherwise you wouldn't be playing Ironman? If that is so try disabling them all and see if the game loads and runs.  
10 days ago - AndrewT - Direct link
I see, I don't think there's much we can do here then, sorry. I think your best shot is to see if the good folks over in the User Mods forum. can identify the problem in the save file.

Good luck with that!