Tried to place a couple of windows, and this happens.They are grey, and doesn't show properly i 3D. How come? The lowermost window is correct, the two incircled are not...
After some trial and error, i discovered that if I deleted the wall and placed it again, it seemed to work fine. But, what happened? I picked up the properties of theese windows from another window that behaved as it was supposed to
Windows 10, Archicad 27