Ubuntu 13.04 / NV 580 3GB with proprietary driver
Broken: Blender 2.6X r61240 (today's Buildbot)
Worked: Blender 2.69 r60991 (last stable)
Short description of error
Bake from Multires on Displacement mode exits Blender when Preview level is on 0. I want to make a point here : when I said "exits" it really exits with no error code, no "crash".
Exact steps for others to reproduce the error
I made the simplest possible test. New file, UV Unwrap the default cube, add a Multires modifier, subdivide to 4, use the Sculpt Mode to do what you want, then set the Preview setting to 0. Assign a new empty Image to it in the UV/Image Editor. Go to Render context, Bake panel, set the mode to Displacement, enable Bake from Multires tick, hit the Bake button and here it goes : EXIT.