This craft has xml edited parts but it worked fine until I tweaked the hinge rotators of the upper wing. Now the game crashes as soon as I launch
EDIT: If I remove the reflectivity of the main structure the game doesn't crash, so this may be the cause
EDIT 2: Now with 0% smoothness it still crashes Link to the craft
@AndrewGarrison I just found the problem
Previously I launched my Monorail craft (that crashes my game everytime). I deleted the sandbox and made a new one and problem solved.
I'll tinker with the stability, I can't ever guess the right value for it :(