IPhone video H.264 will not play in iPhoto '11 Slideshow

Hello,
        I use iPhoto to organize videos and .jpgs; I take videos both with a Sony camera and my iPhone. I often trim videos in iPhoto and then play them as part of a Event or Album, along with .jpgs, using the SlideShow feature before moving on to iMovie or Keynote. Recently I have encountered difficulties with iPhone H.264 videos, particularly in vertical format -- they simply won't play in the iPhoto simple SlideShow and lock it up (a simple X then ends the SlideShow and iPhoto is no longer locked). The vertical iPhone videos work in iMovie if I simply move them there. I have not detected any problems with the Sony videos, which are invariably horizontal. I am not experiencing any other iPhoto issues although my library is >125GB.
     Any Suggestions?
    Thanks for your thoughts.

léonie,
     @#$^$%^ Computers!
     After I realized I could not determine the frame rate (to respond to your post), out of frustration I went back, restored the most troublesome video to original, closed iPhoto, re-opened iPhoto, re-trimed the troublesome video, and .... yep, you guessed it .... it worked fine. It had to be something in the trim process.
     I haven't taken time to check the others that were problematic, but I'm confident that was the problem.
     @#% how much of my time; how much of your time.....but, still far better than the years I spent watching a rotating hourglass.
     Thanks for your interest, your offer to help, and my best to you. (And, my apologies for failing to include the accent grave in your name previously.

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IPhone video H.264 will not play in iPhoto '11 Slideshow

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