I have a 380 EX. It work fine with elan II. Recently purchased Rebel XT. Using p mode, and somewhat rapid exposures, the flash fires but the images are underexposed (ie. dark/ brown tinted) regardless of distance to subject. The EX is supposed to be "compatible". Any suggestions...is this a synch issue? AE issue? Malfunctioning hotshoe? Recycling issue? Neither Canon nor local dealer have conclsions that resolve problem. Thanks for your help.