Hi David, I've been using the software for over a decade and quite familiar with line weights. The problem is all of a sudden, all the line weights that had been set higher all changed back to the default. All new lines no matter what weight you give always now show default 18 weight lines. All my plans from over the years now show default line weight and all thicker or thinner lines changed to default. To me sounds like a corruption of the program but whatever is causing this it's global not specific to one line.