Hi, I'm new to Mac. I need advise from you pro. I have 2 Canon cameras, actually 1 for my husband and 1 for me. Recently, when we tried to import the pictures after a trip from both cameras, we found that for some reasons, both cameras generated the same series of file names for the pictures. We didn't know after we imported the pictures into iPhoto. When we tried to view the pictures in iPhoto.. we saw every other thumbnail is shown, and every other thumbnail is nothing. When we scrolled the page up and down, we could see all the pictures. but when we tried to export the pictures, only the ones that were shown were exported. My questions are: 1. Is there any way we can retrieve the "hidden" pictures back? 2. Is there any way we can avoid this to happen again besides getting another brand for camera? 3. Is it the problem of iPhoto or Mac?? Because if it's only iPhoto, I can really avoid using it. Thanks much in advance!!!