What are the full properties of your .mov file? If not sure, the free MediaInfo software can give you a properties readout.
How are you importing this .mov file into Premiere Elements 11 Mac?
I am strictly an Elements Windows person, but, from what I have read, even iMovie has problems with video from iPhotos.
If you are not doing it now, can you get your iPhoto .mov to the computer desktop and from there import that into your Premiere Elements 11 Mac, using Premiere Elements' Add Media/Files and Folder?
We will be watching for your follow up.