Unexpected result of the decimate modifier (collapse mode).
To do :
- Add and Apply a subsurf lvl 6 on default cube
- add a default 'Decimate' modifier (Collapse, invert:False, Tri:False)
- play with the 'Ratio' value

Bad decimation occures from 1 to 0 (near one, decimation doesn't happen on all the surface, near 0 mesh seems to 'explode').

Blender 2.64 (rev 51939)
Ubuntu 12.04