Ah ha --- that is good to know. My top wheel was also set to adjust ISO. And I can see that whenever I moved it, the camera would leave Auto ISO mode and not allow me to go back. So I would have to do it by other means. My M-Fn button is programmed to switch to video mode. If I toggle that and then go back to photo mode right away, then I am returned in Auto-ISO. Nice! But even better, I decided just to eliminate the ISO adjust from the top wheel, and use it for exposure compensation instead. I love shooting in Manual with Auto-ISO. I can't think of a better way to go. And having super quick exposure compensation is also incredibly handy. So that's what I'm going with now. It suits my shooting preferences perfectly. Thanks for all this feedback!