I've got the same problem with an Amazon S3/Cloudfront setup. It seems to upload the files to S3 fine, and they are available via cloudfront if I try to pull up an image directly, but on the back end it keeps giving me that error. It's weird because the files are being served from cloudfront when my site loads, but when I run a test through webpagetest.org or yslow, it shows that none of my files are being loaded through the CDN. (I know they are loading in my browser because some of the files are missing from my local server, but they still load with the rest of the website.)
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