I have a Canon Powershot A570 IS. Today I took it out to take some pictures of the creek, where I noticed there was something wrong with my Tv (shutter) mode. Anytime I take a picture in this mode the result is just a bright white picture. I thought it was just overexposure since it was bright out, but when I brought it into a shaded/dark area it had the same result. Other modes seemed to work just fine.Is this simply a result of it being too bright out, so it's capturing too much light even in a 1 sec. time lapse, or is there a setting I need to adjust for it to work? It was working fine just yesterday an and this is the first time I've had this problem