--- Operating System, Graphics card ---
Windows 7 x64, GTX660

--- Blender version with error, and version that worked ---
2.67 release, 2.67a release, 2.67b release, 2.68 release, 2.68a release, 2.69 testbuild1, 2.68 r60427, it worked in 2.66a

--- Short description of error ---
When using a Spotlamp with the halo setting checked, a small lightdot shines (as shown on "blender_268a_volu_lightning_bug_marked.png") through objects in front of the lamp.

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
Just hit F12/render in the attached .blend file...