I got this bug and i do not know what to do and what is causing it. I have a licensed eductional version of archicad and i have worked on this file for a few months and since last night I cannot work in it anymore cause a few moments after i open it it gives me this bug and ...

I have a 3d model with a sloped terrain. When i tried to place walls or beams there is a certain area that makes the element invisible in 3D. Has anyone encountered this problem and knows how to fix it? I am reffering to the big opening in the blue wall. Operating system use...