Grey thumbnail pics after rebuilding question mark thumbnails

Hi there,
Is there anyone who can help me with this:
I use iphoto11 and it looks like a whole bunch of pics from 2010-11 have gone first into thumbnails with ?marks, some I could go to 'revert to original' a tedious process then I follow the iphoto blog/instruction retrieve thumbnails only and cahes both- long process! and... now am left with grey thumbnails hurray!
what do I do ? Any help to help me out of this would be much appreciated Mirella

Sorry but you're post is not very clear. But to rebuild thumbnails:
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

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