I am losing music with slideshows in iPhoto.

Question

After a recent automatic update (I think to the operating system), the iPhoto program began losing all music associated with slideshows, seemingly whenever the power was completely shut down.  I am using iPhoto 11, version 9.4.3.  After the power has been shut down, the music files previously associated with the slide shows are no longer associated.  I can see my iTunes library in the iPhoto program, but it will not let me add music, and gives me an error message something to the effect of, "...cannot be added because the original file cannot be located."  If I go into iTunes and create a new playlist, I can then again add music to the slide shows.
I did not have this problem prior to the recent updates.  Is there a way to maintain the link between the iPhoto slide show and the music even if the power is shut down?  It seemed to be able to do this prior to the recent updates.
Is there a way to save the entire slideshow to a file or DVD, so I can simply play it from a DVD or re-load it?
This seems to be an issue with the recent updates required by Apple.
Thanks.

Answer 1

1. As a former and current PC user, I have had several problems because I failed to update PC programs as recommended (security patches in Adobe Flash Player, etc.).  I assumed Apple was the same way; the programs would generally work better and be more secure if I installed the recommended updates that periodically arrived from Apple.  Perhaps I am mistaken and you could offer some better suggestions.
2. I am using iPhoto '11, version 9.4.3.  It may not be the version I was using when I initially encountered the problem a few days ago.  When it happened, I checked the Ap store for recommended updates, and there was one for iPhoto, so I updated to see if that would fix the problem.  It does not seem to have fixed it.  I purchased this iMac as my first Apple system nearly two years ago, and have been using the software that came installed on it, altered only (as far as I know) by the recommended updates.  I generally really like it.  I am using Mac OS X version 10.7.5.  I don't know how to check to see if the iPhoto version is compatible with the OS X version
3. The exact error message is, "The song "____" could not be used because the original file could not be located."
I have some slide shows on the iMac that we put to music out of iTunes and play on the iMac.  As long as the computer is put to sleep, and not shut down, the link to the music remains.  If the computer gets shut down, the iPhoto loses the link to music files.  When I open iPhoto, the slide show is there, but the music does not play with the photos.  When I open the music settings, I can open and see my iTunes library, but when I drag songs into the field for the slide show, it will not allow the songs to remain in the field.  I then double click again on the song I just tried to add to the slide show, and the error message above appears.
I went to the support page, and it suggested that I close iPhoto, go into iTunes, copy the iTunes Music Library.xml file to the desktop, go back into iTunes, create a new playlist, then open iPhoto and try again.  Going through this process seems to allow me to again add iTunes songs to the slideshow.  I just lose everything again whenever the power shuts down.  I thought saving the slideshow onto a DVD might work, but I have not figured out how to do that yet.  Is that a reasonable solution?  I could potentially save them to a DVD, flash drive, or the back-up Airport disk.  It appeared in the support community that people had difficulty with saving the format when the slideshow was saved directly from iPhoto, but that it worked better when first transferred to the video program (iMovie?).  I have never used the video program and don't know if I even have it.  I welcome any suggestions you may have.
4. I have not noticed any other strange things with iPhoto.
Thanks for your help,
B