System Information
Win7
Intel(R) Core(TM)2 Duo CPU
E8400 @ 3.00 GHz 3.00 GHz
RAM 2,00 GB 32 Bit
Graphic card Intel(R) Q45/Q43 Express Chipset
(no other computer for testing available, the crash is reproducible)
Blender Version
Blender 2.75a c27589e
Short description of error
Node-editor. Insert a mix shader direct in the existing line.
That's it.
Exact steps for others to reproduce the error
Node editor, shift A, select Shader->mix Shader, drop it on the line.
(Blender crashes even when using the "Add Shader".)
The reduced file: