Hi Paul. i have had two Ex1 camcorders since day 1. There is nothing wrong with your Ex1. shooting white dresses on weddings is a task and half to achieve without blowing the details and keeping good exposure on the overall subject. hence sony added this feature of shockless white. i am more than certain you have this set to OFF in your camera menu. (menu/camera/shockless white)
i have mine mostly set on 2. shoot a subject with white details with different settings (OFF, 1,2,3). hope this solves your problem. arif.