I searched and didn't see a thread that addressed this yet, although honestly I didn't really know what to look for! Every night when I remove my Watch, I clean the front and back with a microfiber cloth to get the sweat and smudges off of it before I place it on my charger. Last night, however, I immediately noticed something a little different with the back of my Sport. The right LED on the back looks slightly dislodged or "moved over" from the inside. Although it's a bit difficult to see in the pictures, you should be able to notice how the left LED is a perfect white circle, while the right one is not. I had trouble getting my iPhone's camera to focus on it, but it really does look more severe in person. I do not recall bumping my watch into anything yesterday, or doing anything out of the ordinary that could have caused this. I'm wondering if anyone else has noticed this in their watch, and if it could somehow affect the heart rate monitor? Do you think it's worth taking it to the Apple Store for? I do have AC+ if that means anything. Thank you!!