Omg, when I am on building mode, building! Theres a small blue square that appears all the time and it makes my screen jump and move all over the place, also when I have selected something like a chair or the fireplace, it decideds to put it elsewere like outside! So I have to pick it up again and try move it, but the square keeeps appearing, Help because it is so fustratingt! How do I get rid of it????