Hey folks!
Posted this one here since it seems to be a NWN bug, rather than an Arelith-ism. Every so often, models (players and NPCs) tend to - Well. Do this:
I've realised I can fix it in that instance by toggling 'Environment Mapping on Creatures' off and on again, but it'll reassert itself when I load into a new area. I've also had the issue on two unrelated computers, so I don't think it's exclusively something on my end.
Has anyone else been beset by terrifying mercury people? How did you fix it?