My 5D just started acting up. The body will not activate any attempt to focus when pressing the shutter release button halfway. It's not the lens as it acts the same with all my lenses and the lenses focus fine on my other bodies.
When I change the focus to the * back button the 5D focuses fine with all the lenses. So my conclusion is the halfway depress function of the shutter button to initiate focus is no longer functional. I'll have to take it into Canon for repair (it still needs the mirror recall replacement done anyway).
Anyone else run into this problem? One minute I had AF, the next there was nothing, relegated to either MF or back button.