I just was trying to detach some corps from a quiet sector and move them off to someplace more useful. After I had detached two corps from an army, I realized that one of them was an intrinsic corps of that army, so I decided to put him back again. I spent twenty minutes doing everything I could think of to put him back in again without success. I've attached the save game. Try to put the 6-4-7 corps in the detached stack back into VII Army in Colmar. And let me know the exact steps, including where on the screen you dragged the shadowy image.
Thanks.
This game needs an "undo" button.