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I was having the same problem, small images would upload fine but large images would result in a blank screen. I solved the problem by disabling
Use GD library for image processing
in the Advanced settings area of the admin panel.
Large photos upload perfectly then. I uploaded a photo 2048px × 1536px without a problem
http://www.ukgardeningcommunity.co.uk/photo/gallery/Berberis-stenophula-flower
Paul