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Anons - I've been experimenting with image resolution and it "appears" that the image server may be having issues in compressing your original files into thumbnails if the original dimensions are over a certain size. Try resizing your original images to around 500 x (something) or (something) x around 500 and see what happens. I've run into this before when a server is running out of resources and just bonks trying to compress an image file.