HAd some problems with a macbook so backed up everything to time machine then had OS re-installed. Nikon RAW files from summer holiday now show as dotted line squares in iPhoto. All the information about the photos is associated with these squares, but the image cannot be viewed. Nikon RAW files uploaded to macbook since backup view fine. Have tried Reprocess RAW from the iPhoto menu but this makes no difference when applied to the missing images...This is all happening in iPhoto v8.1.2. Any help greatly appreciated as I would be very disappointed to lose some special memories due to a faulty back-up...Thanks