I am having the same issue with W3 and MaxCDN, I disable the plugin and all my images that are in the Media library load with out an issue (my logo, slider images, etc). I thought maybe I missed a setting somewhere, let me know ASAP.. Otherwise I need to disable the plugin and use something else.
Version: 0.9.5.2
WordPress 4.7.1 running MesoColumn theme.
Fully Hosted with PHP 5.6 on dreamhost
Thanks
Kelly Brindle
girlbrains.org