When trying to use the cleaning tool, the lines denoting the area to be cleaned do not show up on the scan. They show up at the bottom of the screen, off the model, and are in front of what is there on the screen, ie the taskbar. The area that is clicked around cleans properly where it should. The issue is that it is impossible to make fine trims when you can't see what you are doing. Using version 4.5.3. I didn't have this issue with previous versions.