Right around the power port. It's minor, and isn't anywhere else on the computer (Unlike my old 12" PowerBook, where the entire surface above the keyboard was bubbled), but I've noticed if I don't plug in the adapter just right, or if I move it too much after plugging it in, nothing gets through and the battery won't charge. I've had the PB since late February - I'm worried it's too late, and the problem "too minor" for a repair or an exchange. Anybody else faced this problem? Any thoughts?