Andy, thanks for the suggestions. This happened while I was using my 50/1.4D. I've tried different lenses, including the new 14-24/2.8, my 85/1.4, 105/2DC. The contacts look very clean on all the lenses and on the camera. I tried using a different battery and a few different CF cards - including reformatting them several times. I also reset the menus to default.
Lenses, batteries ...



