OK, on week 2 of my first sensor, and I can't wait to see my endo tomorrow, this one is borrowed (from my daughter, she has type 1 too), I'm hoping he will support me in trying to get one from the insurance company. I am seeing like a fiber or hair in the screen. I know it's not cracked, it moves and has a shadow. When I called dexcom to ask about it, they saud things can get into the screen through the download port. Anyone else experience this? I'm considering getting one of those rubber like skins to try and keep things from getting into it, but I was just wondering if anyone else has this problem.