Multi-hex buildings vanising if the key hex is destroyed has always been an SP "thing". I put in code long ago to make the other hexes of the multi-hex building register as a building (in the original SSI code, the hexes other than the key were left as clear or whatever terrain IIRC). That was long ago in the MS-DOS days of the game.
But it still comes up from time to time.
As to your weird scenario - looks like you have a corrupt set of terrain tiles?. As zovs said - reinstall, but I would do a windows disk check as well, there may be lost clusters.
The Following User Says Thank You to Mobhack For This Useful Post:
Thanks everyone. Looks like I need to dig out my old game CD and do a reinstall.
I know you've heard it before but Don, Andy and the team... you're the best! Thanks for continuing the SP legacy long past when most other games fall by the wayside.
__________________ "The beatings will continue until morale improves!"