Hi.I'm using iPhoto 6 and there is mt problem: Once in a while, iPhoto tells me I should rebuild my thumbnail library and I can click on "OK" or "Rebuild now". I've already clicked on "rebuild now" but the message still keeps appearing... HELP! P.S: Also, when I scroll through my library, and when stop scrolling, the photos become darker and and come back to normal...It happens EVERYTIME I scroll, and it's horible! Dark to normal everytime! THANK YOU FOR YOUR HELP!