I recently switched a project from Development to Production Mode on cloud.typography, uploaded the files to S3, and none of the fonts were rendering completely.
It seems that Amazon's web uploader doesn't assign the correct MIME types for .eot
files.
Make sure that the Content-Type for your .eot
files is 'application/vnd.ms-fontobject'
Your .css
files should have a Content-Type of 'text/css'