My blogcam seems to have developed a problem, in that there is a darkened area on the upper right hand side of the photographs it takes. It looks like it might be caused by a bit of dust. The spot gets progressively more obvious as the lens moves towards its maximum zoom, so I conclude that the speck of dust is on the glassworks as opposed to the CCD sensor.
I have tried removing the spot with image editing software (GIMP) and this works to an extent limited by my lack of skill, but takes a long time, maybe 5-10 minutes per picture. I probably need to take the thing in to a proper camera shop, but meanwhile a work-around is to hold the camera upside-down when taking pictures. It takes a matter of seconds to invert a photo, and although you can still see the dark spot (now in the lower left-hand part of the picture) it is much less offensive.