I have noticed that when you add a new compound objects in Blender 2.57 the object are pulsing very strong. If you increase the physic substeps to 5 the object begins to jump over the surface.
I found out that this bug was introduced in r56321 by changing the default collision margin from 0.0 to 0.04.
The last value (0.0 or 0.04) seems to be stored in the blend file, because if you open an old file it is working in the actual Blender version. If you open a file that was made with an actual Blender version it pulsing in any older Blender version to.