walls show a single plane

[christian cuppers]

Hi everyone,

I'm trying to create a wall in a specific area, but Archicad isn't displaying the wall correctly. The wall appears to be only one pixel wide instead of 300 mm.

When I place windows, Archicad displays them as floating windows, even though the wall should be there.

Does anyone happen to know how to fix this?

Thanks in advance! 

Operating system used: Windows 5101