I recently purchase a new E-PM1, and found a couple hot pixels on the still pictures and videos. Without knowing the on-camera Pixel Mapping functions, I got an exchange. The second one exhibits the same thing, but I tried the Pixel Mapping function and it did map out the hot pixels on still pictures, but they still exists as pale grey dots on the videos, which look like the digital noise. Trying for my luck and went it for another exchange, and the third one is the same! These hot pixels stay at the same location with image stabilization OFF, and move around in the approximate same area with image stabilization ON. I'm really wondering if hot pixels is so common on this model, or in general on Olympus m4/3 sensors, or am I just unlucky? I'm too tired to do another exchange if that is the case.