i recently cleaned up and organized my 2000+ photos on my macbook. i had everything in iphoto but exporting them was giving me problems since they were so disorganized by roll numbers and such. in the library folder i went through and renamed and organized all of the photos. i now have a problem where i go into iphoto, and if i make the thumbnail scale large i see only blank white boxes. if i move the scroll down and make the thumbnails small, all of my photos are there. however if i double click to view any of them or open them in edit i get a grey box with a ! in it. i read in iphoto help that it said moving and renaming things in the library can cause these problems, but it seemed that because i still had all of the photos on my computer i could fix it. i did what it said and tried dragging the files to the iphoto app on the dock, but it just says the file is unreadable. why is this happening? what should i try next? thanks in advance for any advice.