BTW Neuro, why does LV silent shooting results in the lights not firing?
In live view mirror is up and the shutter is open, so an electronic first curtain is used. I believe live view silent shooting complicates the timing of the shutter with the flash, but I'm not positive. My speculation aside, the manual does state that a non-Canon flash will not fire if live view silent shooting is set to Mode 1 or Mode 2 (p.189 of the 5D3 manual). It is set to Mode 1 by default.
Thanks a ton for this.
did it work?