This has driven me nuts trying to find a solution. Apple product specialists and engineers are currently looking into these issues with QuickTime X as well as 7 running on Snow Leopard. I've been going back and fourth with them for the last few weeks. Here is all my documentation along w/ screen shots. I am attempting to create a workflow so that C4D, AE, FCP, PS, & QT will all present the same file consistently in terms of color/brightness across multiple applications. If anyone here knows of any workarounds I'd love to hear from you. p.s. If you performed an erase and install of Snow Leopard and do not happen to have the install disk handy you can attempt to open a Quartz Composer (.qtz) file with QT X and the OS will ask you if you would like to download the SL version of QuickTime 7.