Iphoto slideshow music stopped working

Question

I was creating a slideshow in Iphoto with about 5 songs.  Was working for a while in Preview.  I edited the slideshow and then came back to re-start the music.  Nothing playing, although all the songs are in the Custom Playlist and the box is checked.   Very frustrating.... I worked on this slideshow for several hours and ready to finalize.
Also, I think I am on an older version of IPhoto but the app store says Iphoto 11 downloaded.
How can I fix this ?  Help !   Thank you.

Answer 1

Go the the iPhoto menu in iPhoto and select About iPhoto.
That will tell you what version you're using. 
Have you tried removing the audio from the slideshow and then add it back.
A basic fix you can try is as follows:
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your
     User/Home/Library/ Preferences folder.
2 - delete iPhoto's cache file, Cache.db, that is located in your
User/Home/Library/Caches/com.apple.iPhoto folder (Snow Leopard and Earlier).
or with Lion and Mt. Lion from the User/Library/Containers/com.apple.iPhoto/
Data/Library/Caches/com.apple.iPhoto folder
3 - launch iPhoto and try again.
NOTE 1: 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.
NOTE 2:  In Lion and Mountain Lion the Library folder is now invisible. To make it permanently visible enter the following in the Terminal application window: chflags nohidden ~/Library and hit the Enter button - 10.7: Un-hide the User Library folder.
OT