I am not sure based on your post, but it looks like maybe you have unhidden some shapes in your scene that were previously hidden. Open scene explorer and see what is in the scene. Are there objects in the scene? Select the arrow/shapes in your viewport and see what is highlighted in scene explorer. If you click the eye icon off in scene explorer and the object dissappears then you have located the shape.
Also, if you reset the scene in max there shouldn't be any such shapes in your scene unless you specifically created a maxstart.max file with them in it. Are these shapes appearing in only 1 scene or do you see them when max first opens?