http://app.pluralsight.com/bookmarks just doesn't show the bookmarks when the rule "pluralsight.com" is enabled.
Disabling the rule fixes this issue.

Hint:
When the rule is enabeld I can see this in the developer console:

XMLHttpRequest cannot load https://app.pluralsight.com/templates/user/bookmarks.html. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://app.pluralsight.com' is therefore not allowed access.