LibreCad suddenly doesn't print anymore

I started using LibreCAD today and made a drawing. Initially I could print (OSX) but when I print now it says 'print complete' and nothing happens. Printing from other programs does work. I one printed to PDF maybe that's the cause but I don't seem to get it work. Any ideas?

I don't know anything about OSX, but I often encounter a similar problem under Windows. It happens, I don't know how, that in the system's printing dialog, "Print to File" is activated. So no real print-out.