I ran into this issue before in 1.10.
I think its a problem with the shift-select function. When you select a bunch of ships and you HAD a ship you had previously selected, it seems the orders go to the previous ship or something happens that creates the crash. You can replicated it, at least on 1.10, If you create a fleet of 5 frigates and one cruiser. Click on one of the frigates, then without clicking on anything else, hold shift and select the other frigates. Then try to create an escort order to the cruiser. The game crashes either when you start to save or start a mission. However, ctrl-click to select multiple ships works fine.
Its a small error, but from my experience in doing drag and drop in just simple OpenGL applications its a pain in the butt:P You have to implement everything from scratch and all the users expect it to work just like windows:P
PS - I am at work so I might of missed something in my crash instructions.