First, congratulation for this very useful plugin! I'm using it on several of my WP sites. It works fine on all of them, specially after updating to 18.104.22.168.
But in one of my sites (informateca.net), I don't have the option to update the files out from the media gallery, by using the "Optimize more" button. It was not available with 1.7.1, neither with 22.214.171.124. I've tried also to add the wp-content folder in the EWWW options field called "Folders to optimize", but after saving the changes, the field is empty again. I also tried to delete the plugin and installing it again, but the settings are kept. Is there any way to fully reset EWWW to try to get rid of any old settings issue? It's strange, because it works perfectly on my other sites, and all are hosted on the same server.
I'm using WP 3.7.1, and here is the debug info FYI: http://pastebin.com/aK4drws2
Thanks in advance and regards!!