Zombie Cave will freeze if I send an actor into the pit to activate the ronin assault, switch to my guard character, and start firing at the dropship with a modified napalm flamer.

Could it be the napalm flamer?
Does it fire without crashing?
And at what stage does it crash, when you fire, when the fire touches the ship?

Ah, right.
The flamer is just more powerful.
The flamer works any other time without crashing.
It only crashes when it hits the dropship.
I've been able to reproduce it.

I haven't tested other weapons.

so test other weapons and come back?

Does the flamer crash in skirmishes? If so, it could be too powerful, and perhaps (just a wild guess here) it is so powerful that when it hits a dropship some physics reaction crashes the game.

I was using another weapon and it broke.
It might be my actor but it only has a very simple script on it, one that I doubt would break anything.

Alright, it seems that an actor I use freezes it.
No lua.
I have no idea why.

Can I see the actor?
It may be any Lua or some missing info.