Keynote 09 Media deleted after save error
I have a big problem with a Keynote 09 presentation. It contained a lot of pictures and videos. Last night, Keynote prompted a message that it could not save the presentation because other programs were accessing information. It asked me whether I wanted to go back to the last saved version or save anyway. I tried both options. Both resulted in a "Could not save" error.
Eventually I had to shut down Keynote using the Task Manager.
The result is that only 550 MB of my 6 Gig presentation survived. Almost all videos and most pictures are gone. Only the shadows of the custom animated objects remain.
I tried to rename the Keynote presentation to ZIP and place the movies into the folder. It did not work. And I cannot find the pictures on the computer either.
Is there any way to recover the presentation? I am very concerned about this error. Because I cannot trust a program that discards days of work by accident.
OS X Mountain Lion (10.8.2)