Some icons are not showing

Some icons are not showing for me in Chrome 51.0.2704.103 (64-bit) and Safari 9.1.1. 

This is how it looks: 

![screen shot 2016-07-20 at 21 53 17](https://cloud.githubusercontent.com/assets/9110669/17000763/6a8fbf3c-4ec4-11e6-9ba3-f59ec4dc4b13.png)
![screen shot 2016-07-20 at 21 53 24](https://cloud.githubusercontent.com/assets/9110669/17000762/6a8c5a0e-4ec4-11e6-9c09-f818391a9f2f.png)
