Re: 580 MK 2 flash problem
Hi Mick,
I haven't come across the same issue but it might pay to clear the speedlite's custom settings. To do this you need to have the 580 exII attached to your camera hotshoe and go to Menu >> External Speedlite Control >> Clear All Speedliite C.Fn's.
See how you go, Ben.
Re: 580 MK 2 flash problem
Another thought actually, check to see if you have C.FN 5 set to 0. That sets the flash metering mode to E-TTL. I have the C.Fn symbol displayed on mine all the time because I have a couple of things tweaked but I've never had an issue setting metering mode to E-TTL.