Hi,
This is a bug - not wish, of course. It is already fixed in our internal code base but since the fix affects several base macros, we can't give you one file to replace. The problem will be fixed in the upcoming v14 release (and in all national v13 library updates released after November 2009).
I'm sorry about the inconvenience.
Regards,
Zsolt Táskai
ArchiCAD Development - GDL Team
AC13, AC14 and upwards...