iphoto images appearing as grey boxes with white lines
a lot of my photos have suddenly appeared as grey boxes with dotted lines around.
iMac (27-inch, Late 2012), iOS 7.0.2
Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Include the option to rebuild the thumbnails. It can take 3 or 4 goes for this to work