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Sorry to hear that you are having this problem. Have you edited your picture in Photoshop or other graphic program? If you have, then it is possible that the picture's color mode is set to CMYK, which is not web-friendly. You will need to resave the picture with the color mode set to RGB-16bit and this should resolve the problem. You can do this is to choose "Save to web" in your graphics program and it will be saved in the correct format.
Another way to test it, is to upload a different picture. If loads successfully, then there is a problem with the picture you are now trying to upload.