Under the Javascript heading
Aggregate JS-files? “Aggregate all linked JS-files to have them loaded non-render blocking? If this option is off, the individual JS-files will remain in place but will be minified.”
The plugin is using a lot of javascript, so cacheing/minifying it causes it not to work. Im sure you can dive into there code and exclude the files individually but i didnt have the time or the patience to do that when there plugin needs a lot more updating Squares end.