I have the same problem using the Optimus plugin. I’m guessing same root cause (no image sizes created?) so adding comment instead of adding a new post.
For those issues of course you should ask the developers of those plugins. There are other plugins that works with WP Retina 2x though such as EWWW Image Optimizer and Smush.it. They are the two most famous ones. If Optimus of Tinypng wants to optimize the @2x, it’s extremely easy but they should be aware of it 🙂
Where is Retina 2x saving the retina images though? Tinypng should be able to optimize anything in the media library. Thanks
They are next to the normal files, but they are named with @2x. They are not in the media library because they shouldn’t be there, they are “shadow” files for the real ones.
