Line Snap to countour graphic glitch.

Hey guys I’ve been using Harmony since initial release to 12.2, but it seems like the snap to contour is still a problem for me (even after i moved from windows 8 to 10).

Whenever I turn it on to do linework with the line tool, and try to zoom in/out or move around the entire screen glitches and makes it completely unusable. As soon as i turn it off there’s no issue.

I have a gtx 970 as my video card. I remember i saw a thread about this before and that something was being done about it but so far it still appears broken to me.