On the 60D, I found the cause of my error. I was shooting Raw-Small for testing purposes. ETTR works fine in Raw (large) mode.
In the raw-small and raw-medium capture modes, "press set" produces no error message. Whatever the problem slamming is still having seems the same as the other raw size capture modes. Maybe you could debug the 6D using the 60D small-raw feature.
In the raw-small and raw-medium capture modes, "press set" produces no error message. Whatever the problem slamming is still having seems the same as the other raw size capture modes. Maybe you could debug the 6D using the 60D small-raw feature.