thats what I assumed, as my girlfriend plays on her acer laptop that has built in graphics, and she gets the same thing.
Well I am using a Nvidia card and the same thing is still happening to me.
Ive been having this same issue since before launch. It went away for a little while, but since 1.4.7 its back and even more noticeable.
I just built a new computer yesterday and have not run into the white stitching issue yet. I am running a GeForce GTX 770 OC edition graphics card, in case that information helps. In the event I do come across any white stitching I will update here with specifics and hopefully pictures.