David Bitton on "[Plugin: W3 Total Cache] Minify Must Use Disk Cache Method When Using CDN"

I discovered the hard way that if you have Minify set to a cache method such as memcached, there are no files for the CDN to upload. So, minify was generating URLs but there were no matching files in S3/CloudFront. I changed the cache method back to disk and the plugin uploaded the files. Just a word of caution.

http://wordpress.org/extend/plugins/w3-total-cache/