ie/firefox raises error in webcomponents.js

[ChenRoth-old]

hey

in IE (10+) / FireFox, i'm getting an error when I try to load a template using the meteor-polymer package

the error source is webcomponents.js line 112:

 function assert(b) {
      if (!b) throw new Error("Assertion failed");
    }
Error: Assertion failed 

has anyone experienced anything similar?