I have the same problem as above. When ever I try to load a ship into the DIY Container, the game loads the ship speratly and it causes the game to disable all of the buttons inside the hangar. (Can't leave the hangar, cant insert a part, can't move or delete a part). I use GC 1.2.0 and KSP 1.3.0
output log:
https://drive.google.com/file/d/1eaXGmWUOG0L-A1S0GdHVQkSeXI0qb1C-/view?usp=sharing