UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36

Steps to reproduce the problem:
1. click on a Polymer 0.5 paper-dropdown
2. notice that the dropdown does activate but does not display. Choices may still be made blind, but there is no visibility in the dropdown 

What is the expected behavior?
dropdown opens and displays correctly

What went wrong?
Console error:
Failed to execute 'animate' on 'Element': 'function (e){function f(a,b,c){return 3*a*(1-c)*(1-c)*c+3*b*(1-c)*c*c+c*c*c}for(var g=0,h=1;;){var i=(g+h)/2,j=f(a,c,i);if(Math.abs(e-j)<.001)return f(b,d,i);e>j?g=i:h=i}}' is not a valid value for easing

Did this work before? Yes Prior to update 52.0.2743.  It was working until I triggered the update. It immediately stopped working when the update was complete and Chrome restarted

Chrome version: 52.0.2743.82  Channel: stable
OS Version: OS X 10.11.5
Flash Version: Shockwave Flash 22.0 r0

This seems to be triggered around the core-transition style and possibly an import call