Yesterday I had problem with tethering the Canon 1D Mark II and Mac PowerBook. I've installed all the latest software and updates. And when I tried to control the caemra from the laptop, I could do almost everything (change the exposure settings, ISO and exposure correction), but I could not make to relase the shutter. It took me a couple of hours to try all imaginable choices, looking through the manuals and searching on the web. It seemed that everyone else was able to do it without problems.
My EOS Capture window looked as in the screenshot to the left. I pressed the spacebar or the shutter button in the window, but nothing happened. The only thing that changed is that small message in the status bar. It is saying "Quiet, delayed shutter". The message appears for a few seconds and then it is gone. So finally I gave up, I could not find the solution to this problem.
My last resort was the Rob Galbraith Forum on Canon 1D cameras. After a few hours I was relieved to get a hint on the problem. Actually I got the solution - This message was about one of the personal functions set to make the shutter sound quiter. So, first the shutter opens up, closes and only when you relase the shutter button the mirror goes back to its place. And after changing the personal function back everything started working as it suppose to. I am very grateful for the help I got from the guys at the forum. And for those who may encounter similar problem I post this message.