Frank Goossens on "[Plugin: Autoptimize] break my theme"

you can see the difference when loading
http://www.filmymonkey.com/wp-content/cache/autoptimize/css/autoptimize_4a0b6792c67210481e48037a65cd0c4d.css
vs
http://d30opejq2nzots.cloudfront.net/wp-content/cache/autoptimize/css/autoptimize_4a0b6792c67210481e48037a65cd0c4d.css

the files are identical, but the first one (the original one) was served with HTTP headers Content-Length:"32440" and Content-Encoding:"gzip" whereas the
the second one (on cloudfront) has Content-Length:"109699" and no Content-Encoding.

Now I don't know cloudfrount I'm afraid, but maybe this helps; http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/ServingCompressedFiles.html

good luck!
frank