This is a minor complaint admittedly, but on a certain spot at the top of the bezel around my screen (just below and left of the camera) I have a black 'spot'. Every couple of days I wipe it away and it returns somehow! The only thing I can think is that maybe something is leaking from the trackpad (ie. from the inside of the machine but via the gap around the trackpad). The machine is otherwise perfect, so I don't imagine there's anything seriously wrong inside... just annoys me! Anyone else? Thoughts on what it might be??