Changing the language breaks the shader when looking through an entity's camera

Steps to represent this bug:
1. /gamemode 3
2. take a creeper/spider/enderman's camera, and the shader is turned on
3. press ESC and then change the language in the menu
4. back to game and you will find the shader stopped working

Here is a video: http://youtu.be/_phGNmoJeKI
p.s. I didn't click the Super Secret button in this video.