**System Information**
Operating system and graphics card
Win8.1 64
Core2 Duo T6600, 4650M radeon
**Blender Version**
2.75a
**Short description of error**
Black screen occured after using node editor and switching to 3d view in Blender render.
This have never happend before.
https://dl.dropboxusercontent.com/u/13451287/plasma.blend
https://dl.dropboxusercontent.com/u/13451287/bug.png