The problem: If you turn the camera on whilst the lens is already extended the M will not fire off a shot at all. If you turn the camera on and then extend the lens it works perfectly fine. If you turn the camera on with the lens already extended you have to retract the lens and then re-extend the lens and the camera will start shooting again.
The issue appears to show up even with the latest firmware (2.0.2). I tested this on my EOS M and the 11-22mm and could not replicate it.
Does someone here experience the same issue? Would be glad if you can post it in the comments. Thank you.