Black bar when rotating by 90 deg

clockwise and counter-clockwise

![image1](https://cloud.githubusercontent.com/assets/1096465/21839043/96bd7790-d810-11e6-932d-646d3557f6c8.png)
![image2](https://cloud.githubusercontent.com/assets/1096465/21839044/96c2f2ce-d810-11e6-84fb-8a317208362e.png)
