Permissions

By default my /wp-content/ and subdirectories are set to 755, but I get the following error:

You don’t have permission to access /themify/wp-content/cache/page_enhanced/library2.gc.cuny.edu///_index.html_gzip on this server.

So I set to:
sudo chmod 777 -R wp-content/

and still get that error.

I saw this:
http://wordpress.org/support/topic/403-message-on-indexhtmlgz?replies=1
but no htaccess restrictions on my development server.

Any ideas?

https://wordpress.org/plugins/w3-total-cache/