The default Main Layout partial in the developer portal CMS refers to an outdated jquery resource from an external CDN.

The CMS already has a more up to date jquery in javascripts and the Main Layout template should just point to that.

This line:

{{ '//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js' | javascript_include_tag }}

Should become:

{{ '/javascripts/jquery.js' | javascript_include_tag }}

This will help to avoid confusion when trying to change the version of jquery.