Ah I see what's going on, it references "box.box" which isn't present in the boxes lib. You need to rename box.dat to box.box. there might be more misnamed items.
It then loads find the next time you start LDCad.
Anyway this is not an LDCad bug
It then loads find the next time you start LDCad.
Anyway this is not an LDCad bug