Never mind, user error.
But, while we’re here, can we send a message to the stair and railing group that macros within railing (and I assume stair) part objects don’t inherit the PEN directive from the calling object. If the object or macro doesn’t have its own PEN directive, parts are drawn with pen #1, which is never right for uncut pens. And to put the directive in the macro isn’t straightforward, since these macros are in use by non-railing objects too.
James M