When you have no backup, it really limits what we can do. At this point we have determined you have a corrupt iPhoto Library, as it does not happen in a new library. You have done all of iPhoto's built in first aid, yet the issue persists. From here, you can try one of two things:
- - Try a 3rd party application entitled "iPhoto Library Manager" to attempt to rebuild the iPhoto library
- - attempt a Manual rebuild. Note the manual rebuild will loose any slideshows, albums, keepsakes etc. you have in your iPhoto Library, but it will retain all the original images. We would then need to re-create albums and slideshows etc. in iPhoto.
Try option one first, as it will not loose your created data from your library.
Using iPhoto Library Manager to Rebuild Your iPhoto Library
Download iPhoto Library Manager and launch. 2. Click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.
3. Now that the library is listed in the left hand pane of iPLM, click on your library and go to the Library ➙ Rebuild Library menu option
4. In the next window name the new library and select the location you want it to be placed.
5. Click on the Create button.
Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments but not books, calendars or slideshows. The original library will be left untouched for further attempts at fixing the problem or in case the rebuilt library is not satisfactory.
If this does not work, let me know, and I can give instructions for the manual rebuild.