I am wondering if you are deleting the roof, leaving the surfacer object?
Yes, the attached object should delete as well, but I am wondering if this is what is causing the problem.
Does it still crash if you delete the accessory first or both the accessory and roof together?
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11