Why Won't iPhoto Export My Slideshow?

Question

I import photos to iPhoto from my Canon Rebel. They were taken as RAW. I create a folder and name it within iPhoto. I place 50 images and order them the way I want. I then "Select All" the 50 photos in the folder just to play it safe. I click the Plus button and choose Slideshow. I go through all the steps, selecting the theme, selecting the Apple canned music (so that there won't be a copyright issue), I set my settings... Show Title, play music through slideshow, etc. I then click the Preview button. It works fine! I then tap the Play button. My slideshow fills the screen and does as I have asked it to. I then make sure that my slideshow is selected in the left column (it has not been unselected since I started this maneuver) and I click the Export button at the bottom of the window.  HERE IS WHERE, AS I SAID BEFORE, EXPORT DOES NOT WORK.... A dialog box comes up: "Export your slideshow Choose a format based on where you will view your slideshows;___Format:" (I have chosen all three choices many, many times trying to get beyond this point.)  "Automatically send slideshow to iTunes" has been selected, BTW.  I then hit the export button and the navigator dialog box opens and I choose my folder called iPhoto Slideshows. I click OK.  At this point the export progress dialog box opens and sits there... the thumbnail rectangle remains BLACK. The progress bar never changes from its standard GREY.  The only text on the export slideshow dialog box remains the same and says: "Exporting Slideshow ..."  Fearing there was a hiccup somewhere, I have left this window open and able to work OVERNIGHT, just in case. Nothing. I have tried all three formats. I have changed the destination folder. Nothing.
I have had this problem for months. Have asked this forum for help. I have been told nothing is wrong with iPhoto.
So here's my new question: "What am I suppose to do about this problem that I have explained above?"
I would say my copy of iPhoto is corrupt, if there is nothing wrong with iPhoto in general. Is this a possibility?  In which case.... How do I get another iPhoto app without having to pay for it?
Or do you have some other reason this process is not working on my Mac Pro with OS X  10.9.5 (13F34)?
This is the fifth time I have had to export all my photos to my laptop and use Snow Leopard with iPhoto 9.2.3 in order to finish my projects.
Please help with these EXPORT FAILURE questions.
Thank you, very much.

Answer 1

To re-install iPhoto
1. Put the iPhoto.app in the trash (Drag it from your Applications Folder to the trash)
2. Download it from the App Store to reinstall It's on your Purchases List* there.
For older versions that have been installed from Disk you'll need these additional steps:
2a: On 10.5:  Go to HD/Library/Receipts and remove any pkg file there with iPhoto in the name.
2b: On 10.6: Those receipts may be found as follows:  In the Finder use the Go menu and select Go To Folder. In the resulting window type
/var/db/receipts/
2c: on 10.7 or later they're at
/private/var/db/receipts
A Finder Window will open at that location and you can remove the iPhoto pkg files.
3. Re-install.
If you purchased an iLife Disk, then iPhoto is on it.
If iPhoto was installed on your Mac when you go it then it’s on the System Restore disks that came with your Mac. Insert the first one and opt to ‘Install Bundled Applications Only.
*Sometimes iPhoto is not visible on the Purchases List. it may be hidden. See this article for details on how to unhide it.
http://support.apple.com/kb/HT4928
One question often asked: Will I lose my Photos if I reinstall?
iPhoto the application and the iPhoto Library are two different parts of the iPhoto programme. So, reinstalling the app should not affect the Library. BUT you should always have a back up before doing this kind of work. Always.