I fired up the W5700 last night to watch a movie and I saw a faint circle in the center on a black background. Yup, it's a dust blob all right. I zoomed in (to a small image) and found a bunch of them, mostly outside the viewing area of the chip in the top left corner and not visible on content. I'm absolutely amazed. I moved away from LCD to DLP for a dust blob-free life, and now this. My BenQ is on a rear shelf in a very clean AV room in which you could eat off the floor. We do have a dog in the house, so that might be a contributing factor, but who knows? These have only appeared since I sent the unit to the Netherlands for 1.0.1 firmware update a couple of weeks ago, so maybe dust got in then.
Has anyone else had problems? Any suggestions? I've clearly now got to ship this unit back to BenQ for a clean under warranty.