I can't figure out how to get rid of these projecting lines. It is a window object thing, it happens in this window with any marker, or no marker. They flip with the window. This is Vent Window 20 straight from the USA library, without any GDL touchups.
[Another relatively minor problem are those red (pen 3) lines in the louvers. There is no pen 3 anywhere in the parameters. There is a pen 3 in the marker, but these ones will not change when the pen for the marker changes.]
