Mine is on the latest and greatest firmware and all other functions are fine.
I may have been wrong the whole time, it may actually be my flash that is the problem. All this time it has only been acting up on my 1D but just now I tried it on both cameras and it would only register in TTL mode not ETTL. If I unlock the flash from the hot shoe and wiggle it around a little bit then it seems to reconnect and stay that way.
Could it just be bad or dirty contacts on my 580? They look clean as far as I can tell...
Sure, take some alcohol to the dang contacts, and make sure you have fully charged batteries in the flash -- they do goofy things otherwise.


(Tempted to get those Flex TT5s though!)










