Hello there, it's us again. :D"

Unfortunately, we stumbled upon yet another error message. :

This again had nothing to do with using a Dualtech (there weren't even members present who could've used them).
Unfortunately, I can't reproduce this one consistently.

But I'll try my best to explain what happened when that error popped up.
A character used a skill that applied a haste state (CTB Speed+25% / ctb order: targets, -2); the character then got hit by a Speed malus (reducing Agility to 1) after that a qued skill from a different character hit an enemy and the game crashed. I could reproduce this one more time and the setup was quite similar. 

EDIT: If I remember correctly, one of the enemies was charging an attack and got hit with a sleep state. Don't know if that would be of any importance.

EDIT 2: To me, it seems that the game crashes, once the turn order is altered with skills (like using "CTB SPEED: targets, +20%" "ctb order: targets, -1" commands in action sequencing) and an actor/enemy has a restriction (cannot move in that case), but cannot confirm 100%.

Sorry that I can't be of much more help right now, I'll try to capture the error later. But maybe you've got a hunch about what could cause this. Sorry again and have a good time!