Not in the 5000km I have put on my Terrain so far.
I did have a similar issue with my old 07 Canyon, sort of a fold line formed on the driver's seat from the fabric bunching up.
It happened for a few weeks right after I got the truck, I would smooth it out every once in a while but after a short while, it just stopped happening altogether. No more fold line or bunching and no noticable sign that there had ever been a problem.