Using build Nightly.2014.May20.6D113
When putting my 580EX II on my 6D, I am not getting the External Speedlight Control menus for : - E-TTL II meter - Flash Sync speed in AV mode - Flash function settings (the one I really want)
I first noticed this when using my Yougnuo YN-622c triggers, and then decided to check it out with the flash alone. It does fire; but not everytime. Batteries are fully charged.