[Trancejeremy]

Upon further experimentation, it seems to happen when there is too many Shard III Cannons in a stack.

I went back to the completely original files, and made a regular large fighter (25 tons) with 3 shard cannons.

I didn't have any problems, until I made a stack of 30 of them.

Sure enough, I get the range check error again.

But it's very very rare to have that many shard cannons in one fighter stack in a normal game. It's a lot easier with my large fighter mod...