Canon has confirmed that there is a problem with the EOS-1D X Mark III. When the camera is used with the electronic level set to 'Show' in the viewfinder display, the camera might not perform normally when operating the AF-ON button or shutter button. A new firmware release is planned for early April. In the meantime, a workaround is to use the 'Hide' setting for the electronic level in the viewfinder display (Menu / Set-up 2 tab / Viewfinder display / Electronic level). Details of the firmware update will be posted here when it is announced.
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