I'm running into the same problem with this. I kind of sympathize with the original poster as this is incredibly frustrating.
My original problem was that it was showing up fine in 2d, but it wouldn't show up at all in 3D, or elevation views (It just showed up as a blank hole in the wall where the window should be). The windows display mode were set as symbolic. Alos, for some reason, this was only occurring in my basement walls, and only on my north elevation. Every other elevation / main floor walls were showing up just fine.
Now, I'm not sure what I did, but I can't even add any windows (or doors for that matter) to the wall. I tried retracing my steps to see if I changed some sort of setting to cause this but I can't figure it out for the life of me.
When I have the window tool activated and hovering over the wall, it shows that I can place the window (or door) but when I click to actually place it, it vanishes. Not showing up in 2d, 3D, or schedules. Anyone have any idea what I did to cause this? Its all most as if the project is locked from adding anything new, however it does let me delete windows / doors, just not add them.
Thinking maybe my Archicad somehow lost its licence, I then started a new project and I could add windows / doors to a created wall without a problem. It seems to be related to this one project file I'm working on.
Any help would be much appreciated! thanks guys
ArchiCAD 24 Full
15" Macbook Pro (2018), OSX 10.15.7
2.6 GHz Intel Core I7, 32GB DDR4
Radeon Pro 560X 4096 MB[/size]