Thanks for clarification, Stas.

I observed that single shots (not all) shaked when taken and were blurry in Live View. To be honest, I never verified with the physically taken pictures (though it is difficult anyhow, because given the little DOF almost the entire picture is blurry). I thought it is ...

Although announced as fixed in the release notes of 3.4.1, I still experience the problem in the latest 3.4.7 on Mac.
When connecting the camera, MLU status is displayed as ON. But as soon as I Start Shooting, it automatically switches back to OFF.

Canon 5d Mark III with latest firmware, Canon ...