I don't now if this is much help, but I shot a wedding a couple of weekends ago, and my PWs worked flawlessly. I am using the PW Plus III's and I do not know if that has anything to do with it. I did notice one quirk, though. When the bride and groom were leaving, I had the camera set to AV and as I fired off a series of shots, a couple of them were tremendously underexposed. Most of the time I use manual, so I did not notice this until I shot in AV. There series of shots were all at f2.8 and about 1/500th of a second, except for about three of them which were 1/3200th of a second. That's a pretty big shift in exposure. I will pay attention and see if it happens again. Anyways, sorry and I didn't mean to hijack your thread.