Hey guys, this is really driving me nuts. Anyone familiar with these lines appearing in viewport? I think I hit some odd hotkey sometimes and I turn this on and I can’t for the life of me figure out how to get rid of it. Thanks in advance.
They look like curves. If so, you can clear them using Stroke: Delete
http://docs.pixologic.com/reference-guide/stroke/curve-functions/
Thanks for the info! The next time it turns up, I’ll give that a try and see if it works. 
Not at all the weird gray lines I was expecting to see. But yeah, Cryrid is in the know…as it were.