Well you are using the internal CM of Mac OSX through its own application - and it looks to be working for you. We did not test to see the interference of the Mac OSX on Preview or it's own Aperture, or iPhoto. We only tested through the Adobe applications because they have been such the standard in color management photography (and fine art for that matter). And we did document changes to grayscale and color images taking place in differing ways since 10.5 was released. "If it ain't broke, don't fix it!"