Unable to edit main model LDCad with MLCad arrow present?

[Jaco van der Molen]

This probably comes from arrow made from triangle and quads beeing included in main file - in this case LDCad treats the whole model as a part. Make the arrow a submodel and it should work.

Ah, ok. Right, thanks.
I usually make it an MLCad part, but I guess a submodel is better.