I've recently rebuilt it so should be OK; Windows 10, Intel i5-7600@3.8GHz, 32GB Ram, GTX1080, OS is on a Samsung SSD and data is on a mirrored pair of 5TB Seagates. My monitor is an Acer Predetar.
I've reset launchbox back to it's default, theme, colour, etc and still can't see the line, suspect my eyes are the weak link ? I have noticed the 3D boxes are ever so slowly starting to populate, so hopefully time will resolve it.