I recently recovered some RAW photos from my memory card that i had accidentally deleted and then imported them to lightroom. When I first imported them they looked fine in thumbnail view but as I clicked on them to view they all turned completely white!
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Did you accidentally apply a develop preset?
What is listed in the develop history?
Can you show a full screen-shot from a photo opened in develop?
Also, please tell us your version of LR, your OS as well as the source (camera) of the shots.