Tried the save again, and could not get the error to appear. Reloaded and doublechecked - Nothing.
Checked the sim again, and nothing.
Re-installed. No difference, seems to have no issues at all.
- What were you fighting against, what ships were in the battle?
A low level named bounty, mostly pirate junkers and a support carrier.
- Did it crash immediately on firing the missile or later?
It was long enough for 3 (maybe 4) missiles to clear the launcher before the error popped.
- Do you remember what specific ship it was fired at, or which ship the second stage might have fired at?
I had intended to fire it at a frigate (decurion) directly in front of my flagship, but a broadsword wing 'overflew' it at the same time I clicked. So it could possibly have been targetted at them instead.
The swifts were grouped with a pair of small mounted BRDY rage srms, not that that should matter.
Mod Versions:
Spoiler
Audio+ 1.0.3
BRDY 0.9.0
Buffalo IIs 0.0.3
DARA 0.8
Dynasector 1.3.2
GraphicsLib 1.1.0
Hegemony Auxiliary 1.1
Imperium 1.17.2
Lightshow 1.32
A custom Portrait pack 1.0.0
SWP 1.3.0
Stop Gap 0.1
Underworld 1.1.2
Unknown Skies 0.21
I am aware that I need to update some most of these.
Time willing, I might even manage that someday.
Even weirder, why it would occur specifically for the medium version of the Swift launcher, is utterly bizarre.
I wouldn't read too much into that, as I have never seen either of the small mounted versions 'in the wild'.
This whole thing is weird as hell, and I feel like a bit of a heel for potentially wasting your time now I can't reproduce this even with the same battle in the same save.