Unable to open iPhoto after upgrade to 9.1.3 (bought on apple store)

Question

Hello all
I am unable to open my iPhoto after upgrading it with version 9.1.3 , bought in the apple store.
The searching icon never stops.
I trieded to synchro with my iPad (where I have a backup of all my pfoto's) but the system tells me that all photo's are still on my Mac.
Can someone help me out, because I am rather a rookie in this kind of things
regards
Waldo

Answer 1

Try this:  launch iPhoto with the Option key held down and try to create a new, test library. If you can then then your library is the culprit.
If that's the case make a temporary, duplicate copy of your library (Finder ➙ File ➙ Duplicate) and apply the three fixes in order as necessary.
Fix #1
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your HD/User/Home()/ Library/Preferences folder.
2 - delete iPhoto's cache file, Cache.db, that is located in your HD/User/Home()/Library /Caches/com.apple.iPhoto folder. 
3 - launch iPhoto and try again.
NOTE: If you're moved your library from its default location in your Home/Pictures folder you will have to point iPhoto to its new location when you next open iPhoto by holding down the Option key when launching iPhoto.  You'll also have to reset the iPhoto's various preferences.
Fix #2
Launch iPhoto with the Command+Option keys held down and rebuild the library.
Select the options identified in the screenshot. 
Fix #3
Using iPhoto Library Manager  to Rebuild Your iPhoto Library
Download iPhoto Library Manager and launch.
Click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.
Now that the library is listed in the left hand pane of iPLM, click on your library and go to the File ➙ Rebuild Library menu option
In the next  window name the new library and select the location you want it to be placed.
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.
OT