I was having bad focusing problems with my flash photography, speeds all over the place and sometimes never getting a focus. I noticed that the red focus light was not firing 90% of the timer so I thought I had a fault.
Before sending the 580 EX back to be checked I went through all the settings again.
The fault? It was liveview, when I was in that situation I had the problem, switch back and all is ok, red beam fires every time.
Anyone else experienced this problem?
If you have a 60D and a 580 EXII give a try for me.
I'm off to Canon to check for any firmware updates otherwise I will be asking them some questions.