OK. In iPhoto, when you attach a camera, and the app gives a menu that says "import photos" and you click "ok", if its a lot of photos, on a less than right now Mac, it takes a second or two. If you click again, because nothing happens, and you wonder whether your click did anything, when the computer responds, the first thing it does is re-draw the screen, and an icon that says "cancel download" takes the place of the "import photos" one. So when the computer recovers from the idea that you want to import photos, the first thing it does is offers you a dialogue about not importing photos.
I know why it does this, but honestly, how hard would it be to not respond to click that happened before a button was even drawn on the screen?
Come on. ****ing hell. Let's not cache mouse clicks and apply them to things that are not drawn yet.