(Curse my lack of Forum-posting prowess, Right-click and "View Image" to see, sorry!) This Door, to be specific: Telbooze, Camera pointing downhill:

(Took this picture after I rebooted the game, in case that would counter any Crashdump evidence)
This was after I loaded a previous save mid-game, which normally throws some wackiness into the Mix. This time around, I had no squad mugshot Icons (typical for loading saves midgame as opposed to fresh from the main menu after booting up the game, it seems) and that most/all exterior building textures were replaced with the "This save is from a previous version, please import to the newest game version" filler texture.
The latter portion I find strange in that I started this new game IN the current version, and that the textures were fine and dandy before that load save wherein the door caused the crash. First time I've ever encountered that texture issue, also, So... perhaps other folks have encountered this and know why?
The Door operates fine after rebooting. Nothing out of the ordinary: full Condition, belong to the right faction, etc etc.
I guess curiosity killed the cat. Get it Coral? 'Cause the Mercenaries are the Dead Cats?? Dead Cats, Coral!