Having an issue where I move to a part of the map on this mission, near an oak tree with 4 resource zones around it, and the game just crashes as soon as I "discover" one of the resource zones, wierdly it doesnt happen when I discover the rest of the zones just a specific one near the centre of the map.

Cheers for replying, I somehow managed to get it working by loading a previous save I had on that mission and was able to discover the resource zones etc without it crashing. I deleted a file or two in the game folder marked "old_Plants.dta" and another called "Plants more recent.dta" that are not in other versions of the game, just the gog version. So that may have helped.