--- Operating System, Graphics card ---
MacOS10.8.4 NVIDIA GeForce GT 650M 512 MB

--- Blender version with error, and version that worked ---
2.68a

--- Short description of error ---
Applying subsurf to mesh or setting subdivisions to zero crashes Blender

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
1/ click apply on subsurf modifier or set subdivisions to zero

I could not find a workaround (I tried duplicating the mesh, removing shapekeys, cleaning up mesh, etc.)
So for the moment this scene is frozen... any idea ?

Thanks,

Hadrien