Colour correcting hell

I have never ran into this problem but with my luck it happened to come upon an important project I will include a couple screen shot to show you my problem, I applied 3 way colour corrector to a clip and adjusted my levels accordingly. The image looked great in the viewer and on both monitors Im working on, The standard I use to export is a H.264 Quick Time Movie, single pass, best quality, NTSC 720 x 486 16:9 (1280x 720 for final exports). I have used this several times and never have I had such a dramatic shift in picture quality from the timeline to the export. Please has anyone ran into this problem before??



This is the Raw file



This is what it looks like in FCP after Coulour correction and being played on the time line



And this is what it ends up looking like being played in QT/youtube

I have tryed darkening the clip, but it turns out quite the same, to me it almost looks like the filter isn't coming out through the export.

just above your canvas, tic on the little box in the upper right and make sure it is set to black....not white not checkerboard.

did you convert your footage to prores422 before editing.?