Making 90 ton fighters causes Range Check Error in combat...

[Trancejeremy]

Yup, when I change the damage type of the small shard cannon to 'normal' from 'skip armor' I no longer get the range error.

[Instar]

Send it all to MM - saved games, mods, empire files
They will fix it!

[Lord Felix]

I had exactly the same problem with big stacks of Null Space III weapons, as someone speculated about in this thread. It has nothing to do with the extra-big fighters per se. Some weapons are just SO good, the game freaks out when you fire them in big volleys.