Animated iPhoto Slideshow: Cannot recreate my original slideshows

Question

In early 2011, I created 7 different animated iPhoto Slideshows to use as part of my acting and modeling marketing program.  The iPhoto Slideshow software was amazing in how it took still photography and, in a seemingly simple and easy way, transformed it into exciting, highly creative, professional looking video presentations with synchronized music. My slideshows were many times better than the original still photography.
Recently, I needed to update/replace one photo in some of these slideshows.  To my dismay, I discovered that it was impossible to recreate four of these iPhoto Slideshows.  Every time I attempted to do so, the resulting slideshows were nothing like my original slideshows.  Actually, the overall quality of these 4 slideshows has been drastically downgraded to the point of being unusable--for one or more of the following reasons:  the most interesting, unusual setup of 4 photos [up left: square; up rt: oblong; low left: oblong; low rt: square] in Sliding Panels has been eliminated; this results in a lot of repetition of the same setups within this slideshow; in another slideshow, the current software produces a totally different slideshow that is absolutely rigid throughout and will make no changes/modifications, regardless of the photo order or photo format; in one slideshow, the photo alignment is completely off; and the music is not always in sync with the action.
Over the past several months, I have discussed these problems with many different people at Apple Support.  Everyone that I have spoken with assumed the problem was caused by a software update to iPhoto Slideshow sometime since early last year.  On April 6th, after reviewing this problem with Apple Engineering, an Apple Support Advisor briefed me on what Engineering had to say.  The response was basically this:  When the iPhoto Slideshow was created, Apple purposely included an algorithm that continually changes the slideshows.  Therefore, if I create a slideshow today, it may be impossible to ever recreate that same slideshow again because of this algorithm.
I must admit that I am more than a little suspicious about Apple’s response.  It seems just too good to be true; especially due to the fact the stated cause is not easily provable or disprovable.  And Apple Support certainly did not attempt to validate or offer any reasons to support why I should accept this as truthful. Actually, until now, everyone at Apple that I had spoken with assumed the problem was caused by an update to the iPhoto Slideshow software since early last year.  Moreover, 3 of the original slideshows are currenty easily re-creatable.  Finally, this stated cause is so consistent with my experience of how Apple handles all product and software problems:  Nothing is wrong with our product or software.  There must be something wrong with your system or how you are using it. 
My bet is that Apple significantly changed the slideshow software when they introduced the new iPad in late 2011 to accomodate the unique format of iPad. Hence, the iPhoto Slideshow software would work on iMac, iPhone and iPad.   
MY QUESTION IS SIMPLY THIS:  HAS ANYONE EXPERIENCED THE SAME PROBLEM AS I HAVE WITH THE ANIMATED iPHOTO SLIDESHOWS?

Answer 1

Is this the panel you're referring to in the Sliding Panels theme?
If so then it's still availabe in the iPhoto 11 version.  Try a different arrangement of photos.  If that doesn't work try this:  make a temporary, backup copy (if you don't already have a backup copy) of the library and try the following:
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. 
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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.
OT