I tried with built-in library as well, got all the windows removed. Tried with default settings as well.
I've been using ARCHICAD Library 22 - 1.3 Windows 22 - Basic Windows 22 - Horizontal Multi-Sash Window 22. With that I get few windows but not more. This is getting weird
Could it be Windows operating system? Or the student version of the software?
Edit: With .3ds seems to be working the way it should, .skp has everything but it edits some materials (which isn't that important) and makes the file extremely laggy. I can work with .3ds but would love to get .3dm to work, as I'm a bit sceptical on whether .3ds will always work or not. Also, I would love to get all windows, walls, slabs etc. on different layers, now they're all on the same layer.