Auto exposure and auto ISO are totally separate things. It's good to keep the ISO as low as possible to prevent grainy images but sometimes, especially when you're working quickly and the light is variable, it can be useful to use the auto ISO thingy to minimise the chances of you losing pictures due to, most typically, shutter speeds that are too slow for hand-holding.
Can you post an image along with the EXIF data (aperture, shutter speed and ISO) so that we can see what really happened?
-------------------- John
Who could suppose that angels move the stars, or be so superstitious as to suppose that because one cannot see one's soul at the end of a microscope, it does not exist?
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