IPhoto rotates images in slideshow even though the thumbnail for that images has the correct orientation.

This problem seems bizarre to me considering iPhoto 11 has worked with out a hitch since I upgraded from 09 ages ago.  The photos in my album suddenly changed orientation from landscape to portrait and vice versa and sometimes upside down.  I first notice this problem after I tried to click and drag a large number of photos directly from iPhoto to Finder.  I did a Command-A to highlight all the photos from my album and tried to drag them to a folder in Finder.  There are 34,000 photo in this album but only half were copied, (I guess 34,000 items is too much for Lion to copy all at once).  I tried fixing this orientation problem by highlighting all affected photos and selecting "Revert to Original" which fixed the orientation of the thumbnails.  But when you double click on a thumbnail to view the pictures or view the album in a slideshow, some of the pictures still have the incorrect orientation but most were corrected.  Also if I double click on an affected photos to edit it with iPhoto image editor the image suddenly orientates itself correctly.  Then as soon as I close the image editor and view the photo or start a slide show it's displayed with the incorrect orientation again.   How is that possible that all my thumbnails are orientated properly but when I view the photo it's rotated sideways or sometimes rotated upside down?    Any help or insight to my problem would be much appreciated.

Revereting to original will not fix the problem.  When you invoke that menu option iPhoto will read the file again, see the tag that tells it to rotate the file and will rerotate it. 
The most reliable way to fix this is to rotate those file before they are imported into iPhoto. Upload from the camera to a folder on the Desktop, rotate those that need rotating, rename if desired and import.  I use Xee for that because it can rotate the file losslessly.
OT

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