Windows 7
nvidia gforce 210m
and Windows 8.1
nvidia gforce 630m
**Blender Version**
Broken: 2.70a
Worked:tested in 2.69 and 2.66
if i start blurring in the compositor with fast gaussian with smaller chunksize a border disappears in the render.
just Need to render the attached blendfile to see the result. {F92107}