Try changing your view when editing to cut in the void as you may be inadvertently selecting the wrong polygon? ... In the 3DViews menu/F8 Controls/F2 World, then Rotate +Z or-Z as needed.
Also check the polygon to become the void is actually there for the void operation to work. You may have already "used" the polygon when creating the void for the upper polygon?
Use this forum to ask questions about DataCAD 19 and DataCAD LT 19.
Thanks for the reply, Mark. I must have "used" it, like you said. Tried to create a new polygon and void in the lower one, but I couldn't do it, for some reason. I ended up deleting the roof, and re-drawing it. Should have done this in the first place, but I guess that I'm just too stubborn.Wasted a lot of time trying to fix it. Thanks for the help.
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