I've noticed for a while now that the "Double Line" and "Multiline" tools have a strange error in that they do not snap perfectly and if one holds the 'shift' key, the lines don't draw perfectly horizontally or vertically. EXAMPLE:- If I try draw a "Double Line" over an existing single "Line" by snapping to endpoints, the "Double Line" is never perfectly parallel to the single "Line". It can be a little longer or shorter than the single line AND it's angle will not be identical. It appears to be snapping to multiples of a set length and/or angle - almost as if grid snap is active (which it's not). If I enter my own set length and angle then it draws perfectly. The single "Line" tool works beautifully. Problem only exists with "Double Line" and "Multiline". Any fixes / suggestions?