I had the weirdest thing start happening recently: every time I connected a camera or card reader, Canon’s CameraWindow would lanuch. It was driving me crazy. I thought Aperture controlled this function.
Well, the culprit was iPhoto ‘08. It had somehow picked up Canon’s CameraWindow as the application to launch when my card reader was attached. And the darndest part of it was that iPhoto changed my Aperture preference too. Whoa, dude!
So I changed the setting in iPhoto ‘08, double-checked the preference in Aperture, and moved on. So, if you’ve just installed iPhoto ‘08, keep an eye out for this one.