This has been a problem for a while:
When using Regenerate Thumbnails, the resulting files are all lowercase - they do not maintain the case of the original file. This is horrible if you are trying to serve retina images as retina.js looks for a file with the exact name (with @2x).
For example, I have the following files: VIZ001_Cover_Art.png. After using RT, the resulting files are like so:
Unix files are CASE SENSITIVE. Why does this plugin not respect that? There should at least be an option to keep the case of the original file.