Can you reopen the dashboard and check again? It looks like it’s working now, but I’m guessing that one of the external dependencies wasn’t loading earlier when you tried. Unfortunately, I only had my mobile phone on me at that time, so I wasn’t able to look at the browser console logs to see what wasn’t loading.
On a related note, I pushed an update last night that improves support for the ‘2.5 multi’ API and adds an option to pull in the Air Quality (I was just waiting for someone who requested it to test it before announcing). You can update your tile if either of those features are important to you. 