Dynamic (Volumetric) Shadows disappear when used in conjunction with the Colour Tool

Dynamic (Volumetric) Shadows disappear when used in conjunction with the Colour Tool. Plain and simple

http://dl.dropbox.com/u/11742779/GarrysModBugs/ColourToolVoluetricShadows.jpg

Any idea what’s up, or is this a to-be-fixed issue?