What video card are you using that will do 64 bit color? A FireGL or something like that? On most every system 32 bit color is still the max, even if you have a 64 bit OS. I hope you are not confusing color depth and 64 bit processing. Just because you have a 64 bit system does not mean you will necessarily get 64 bit color. I'm not sure about 64 bit color, as far as I know it is very rare, maybe it does require a 64 bit OS and computer, that would seem to make sense. Could you clarify your situation? Thanks.