Yesterday I installed the CDN Module using Amazon Cloudfront and magically everything worked as expected. I was quite happy.
This morning I was showing off my new improved CDN enabled website to a colleague and most (not all) of the image style generated images were broken! And to confuse things even further, when I opened a broken image in a browser window the file was actually Drupal's Access Denied Page.
Digging into this further, I found that the /sites/default/files/styles/STYLE folder was empty. This seems strange to me since it was not empty yesterday when all of these files were uploaded to Amazon. What could be deleting the styles/STYLE folder?
So, I installed the Image Style Flush Module and flushed the style in question. Still nothing, but it makes sense since the CDN module is re-writting all of the links to static content and Drupal doesn't actually get hit to re-create the missing image. How the Access Denied page was uploaded is a mystery as well.
Next, I disabled the CDN module and cleared the cache. Reloading the page recreated all of the images and everything works as expected. But, I need to use the CDN as it's a requirement of the project.
Drupal 7.27, CDN module latest version.
I could blacklist the /sites/default/files/styles/STYLE folder, but that represents almost 30 images that are loaded on every page.
Any advice would be greatly appreciated.