Just replaced my 40D with the 5II, and tried it out this afternoon. Each time I hit the shutter button, there was a soft click and then the viewfinder turned dark. Surprised, I'd hit the button a couple seconds later, and there would be another click and the image appeared. Exposures seemed accurate, but when I tried hand-holding, it appears that the 2nd push of the button is actually the one that trips the shutter . . . very odd.
Tried Live View, and it worked as I expected -- disengaging it didn't affect "regular" shutter-release attempts, nor did moving from single to continuous shooting do anything. I'm stumped!! Any ideas?? Thanks . . .
Admittedly, I've not done much homework on this issue, and haven't even plowed through the manual completely, so this is probably something simple I'm overlooking -- you assistance, however, will do wonders to help restore my sanity.
--Ron