Hello there. I'm new to the world of macs. I have a question... I installed Aperture 3 and it was working fine, but now it stopped working, it won't even open, it says it can't open because a problem has occurred. It tells me to make sure that Aperture works with this version of mac os x and to make sure i downloaded all the updates available. Well, I did, and it was working, I don't know what happened. Any ideas?