Webfaction hosting, behind a proxy - broken dashlet
At least until the most recent 4.7 releases, CiviCRM needed to contact itself via http to populate the dashboard. Your picture suggests that it's not able to, probably related to how the proxy is setup. If you have a command line interface in environment that the code is executing, see if you can contact yourself using, say curl or wget. Sometimes hardcoding the domain in /etc/hosts is a solution.

Another way to mess up your dashboard is with a slightly broken certificate on a https only site - some will render for you in Chrome, but curl/wget won't like it. But in that case, you'd get a spinning thingy.