I've seen live preview working in 4.1.1 on many machines in our office. Can you specify which printers are having this issue? Did they display live preview tracking in previous versions of Simplify3D?
"A bird does not sing because it has an answer. It sings because it has a song."
Same problem here, Got a Felix tec 4.1 printer, since the upgrade live preview tracking shows only the layer being worked on and deletes the layer just build.