Yes, the fringing artefacts are there again. I've just tried loading my image into a panoramic background - it's all out of scale and orientation - but the white reflection/cast has gone, and so has the white fringing.   I wonder if this means there's some kind of bug with the 'normal' image background?   I'm going to see if I can get it to work as a panoramic background with a bit of trial and error to work out the right size, orientation etc.   If that doesn't wor