Freezing after clicking Transitions in demo

I am glad to have found your projects. Very clean and alluring.
I was testing the Polymer dash in the Other UI Elements section of [this page](https://polymer-admin.firebaseapp.com/#!/ui-other), and after clicking the various buttons - when I clicked the Transitions button the screen was blacked out (with the right transparency and all). But, when I clicked to get out of the transition the screen returned to the original color and everything froze, and I am unable to navigate anywhere or click anything. Hitting the Esc didn't help either.
I'm using Chrome on a Win7. I also use [Privacy Badger](https://www.eff.org/privacybadger) {big fan :} and disabled each warning (fonts etc) one at a time and did not have any success doing that test.
Thanks much!