Do have a Javascript or a cookie blocker installed? You need to (at least temporarily) allow Javascript from montagebook.com and google-analytics.com plus session cookies from montagebook.com.
I do allow same-party interaction and cookies. (i.e., anything from montagebook will work.)
You may want to set your third-party analytics services to be asynchronous, so they aren't a single point of failure for your entire application.