Hello Axalon!
I thought i'd post this because Ciaran hasn't replied and i have his same problem.

The Vanilla MTW Campaign map doesn't crash and i can't say for any other mods because I don't own a copy of VI.
But it would therefore appear that the problem lies with the Redux campaign map.

If you could work out a fix for Redux so that people with this problem could use Redux and higher resolutions without the full of hassle alternate fix then I would much appreciate it.

-Nagnar