I've been using a 30D for sports photography, but a couple of days ago used it for an indoor reunion event. I packed it up and took it with me the next day for a baseball shoot and every time I tried to crank up the ISO settings and shutter speeds it would overexpose BADLY. I've gone back and tried every setting adjustment I can find, even cleared ALL camera settings and started over and the same thing is happening.
If I shoot at a slow shutter speed the colors and contrast are perfect. As soon as I move it up past 1/1250 or so it overexposes the picture, almost white across the print.
Any clue what I've done? HELP???