Suggestion for W3TC developers:
- in the Minify page where is checked for duplicated files (eg. <i>"Duplicate files have been found in your minify settings, please check your settings and re-save"</i>) it would be nice if at least is specified the file type (CSS|JS) and the first position (like "File 4.") where that exception occurs.
It's quite cumbersome to dig in both CSS|JS to understand what the message refers to. I believe that all users will benefit from it because we can focus more on development and less on digging within the code/settings.