**System Information**
Windows 8.1, nVidia GT 740
**Blender Version**
Broken: 2.76
Worked: (optional)
**Short description of error**
SubSurf modifier doesn't work when set to Simple.
**Exact steps for others to reproduce the error**
Add a Plane, give it a SubSurf mod, change from Catmull to Simple and set to 6 subdivisions in both View and Render.
Tab into Edit Mode: NO subdivisions (only 4 vertices).
If you try adding a Displace mod (with a new texture), nothing happens (you should see some random spikes).