I have a Rebel XTI with a Bower 724afc flash and am having some trouble with it. Whenever I have it attached my optimum shutter speed goes down dramatically and I have been unable to shoot anything faster than 1" at a respectable ISO. If I remember correctly, when I first bought the flash/camera package...it worked fine. I'm wondering if it is broken or I need to adjust some of the settings. Any ideas? THANKS!