I think you may be correct there Pete. I now use a Nissin Di8622 MKII flashgun on a Canon 60D, so far everything works as it should excluding that menu when the flash is off-camera. Not a problem though as I can still use flash exposure compensation in-camera if necessary.
hi I have tried to post a link here twice now and it says but it doesnt seem to post. if you google 600d and wireless flash you get taken to a canon site and you can download a pdf that shows you how to set it up