Iphoto 11 on macbook pro os 10.7 - can't edit photos

I am using an older macbook pro with lion 10.7 OS with iphoto 11 and aperture 3.  My iphoto library is a rebuilt one because I did have trouble with the original.  All has been working fine.  Suddenly I cannot edit.  On certain photos I get a message saying cannot edit because the photo was processed on an older version photo software.  Not true.  Picture was loaded and edited in Dec. 2012 and I have not changed anything with photo apps.  On some photos if I click on them the program freezes.  I think something needs to be "cleaned up but not sure where to begin.  I checked my disk utility and that is fine.

Typically this is because a photos was edited with an old version of iPhoto - I forget the cut off but maybe iPhoto 6 or earlier - to edit with the new versipons of iPhoto '11 you have to duplicate the photo prior to editing
LN

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