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No amount of attempts at doing this have resulted in rotation.
As there are many photos needing rotation, this is a bind.
Some other similar posts suggested clearing the cache which has resulted in some thumbnails disappearing.
Note, this definitely worked before as I have done image rotation successfully before.
Comments
We can really not tell anything about this without more details. If the meta data within the image is not set correctly, Zenphoto cannot rotate properly. Have you checked that? And if what values is stored for rotation? What camera type?
Of course since they are resized images that need to be re-generated. That will happen as needed or you can use the cachemanager plugin to do this. Also see the user guide on caching.