Operating system and graphics card
Windws 7 sp1 Nvidia 1080TI
Broken: (example: 2.69.7 4b206af, see splash screen)
Short description of error
Simply moving Roughness slider in either LookDev or Display Render Preview modes will crash Blender on my system.
I can usually move the slider a couple of times , then on the third it will crash
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps