Well i'll answer myself now I just figured out what's been causing the crashing; and this is quite curious. It would appear the game engine doesn't like it if you shuffle the game's original ship-models around. For example, I replaced the Alliance Dreadnaught model with the game's original Assault Frigae model, and the Vitory Star Destroyer I with the original Strike Cruiser Model. I'm reasonably certain of this, because I re-installed and tested; loaded my saved Tactical.Dll file with all the changes and crash after a tactical battle! But no problem with any new ship models! There for, how lovely it would be to have new Assault Frigate and Strike Cruiser models....