Mine has that crease in it too. I don't know when it appeared. It doesn't seem to affect performance. However, the big crack down the middle of mine does affect performance, as does the delaminated tail. Hitting cliffs, whether with the tail or with the nose, is bad for the board. Mine is a wall hanging now. I don't know whether to blame it on poor build quality or stupidly aggressive riding by me, but you definitely can kill them. FWIW, this is only the 2nd snowboard I've ever broken (I broke lots of skis in my skiing days).