For me Archicad 11(1086) is not compatible with Leopard. I have many
problems with dwg files. A new dialog appear when I try to attach an
xref (sea attached file). I hope that graphisoft will correct these
problems quickly, while, I return to v10.4 !
thank you for your answers which confirms the impossibility of erasing
these xref layers. So for me it's a bug. I am in phase synthesis on an
important project, I tested many solutions, xref, external drawing, none
give whole satisfaction, damage.