Relatively new to Archicad, and working in V21. But not a total beginner. For no reason that I can think off my model has started behaving really weirdly, and I can't get any work done. First I noticed that doors and windows were "greyed out" in the renovation filter, so couldn't be changed. The i decided to draw the walls again from scratch to see if that would clear the problem, but now my walls don't stay when I draw them. I draw the line but when I click to close the operation the wall just disappears.
