This is Deluxe, build 1181, installed in March of 2016.
This quirk has been ongoing, I think, since the beginning but I never noticed how pervasive it is until recently.
I always draw centerlines in yellow. I don't usually change the line style while I'm drawing because I know what it is. I only change the line style for printing. Then it turns green but it doesn't matter so I never pursued the issue.
I never noticed that the "hidden" line style turns red because I always draw hidden lines in red anyway.
Only now, when I wanted a "dash" line on a blue layer did I realize that the line styles have their own colors that seem to override my chosen colors.
And a funny thing: today when I opened the drawing, the lines on the layer "thread" are now blue dashed lines (what I wanted to begin with), even though the Explorer shows the line style to be "none".
So...let me know what I need to do.