Was stealing stuff in Wrothgar, and went into my inventory to learn a recipe I found, and it pulled me totally out of stealth. Just entering inventory did it, I checked twice to be sure. It was not a "you are seen" break, but a totally pulled out and had to re-set it. This is not a good thing for my poor khajiit, and it will cause her to get caught if opening a crate from a Thieves Trove