What build of REDCINE-X are you running. This is a problem (depends on how you look at it) with the RED. after some updates they change he color science. usually for the better but in many cases like yours, you need the original color to remain the same throughout the life of the project. the only thing i can say is (if you have recently updated to a newer version of the REDCINE-X package) to uninstall your current version including the codecs that are prepacked with it and then replace it with the version you started with. the older version should still be up on their website. i have had this problem before but other than that, if that doesn’t fix it, i couldn’t say. hope this helps. thx.
-jm