Windows Vista has a new color-management/profiling format called Windows Color Systems. It purports to offer advanced color management and better results than the age-old (and forever dying) ICC/ICM color system. ICC has been buggy the whole way, with both political and technical issues plaguing its colorful history.
Windows Color Systems is a step in the right direction, but it comes at a very heavy price: Windows Vista no longer properly interfaces with ICC/ICM color profiles!
Anyone using the ATi Catalyst Control Center, BasicColor, ColorEye, Spyder, or any of dozen other color-management and gamma-correction programs available will have noticed the bug we’re talking about: once you lock your PC (winkey+L) the gamma LUT on your graphics card is reset.