Windows 7 x64, Geforce GTX 295 (CPU rendering)
Broken: Blender 2.69 a65ef6a, buildbot
Worked: never. Checked 3 past official releases.
Short description of error
There seems to be a significant amount of ray misses on dense geometry, causing a visible amount of noise that never clears up, and making the objects look somewhat transparent. This is not apparent on sparse geometry.
Exact steps for others to reproduce the error
Open attached blend, set the viewport to rendered mode.