2 things you can check. In your Quicktime 7 preferences, make sure Enable Final Cut Studio Color Compatibility is checked.
In FCP User Preferences, Editing Tab, set the Imported Stills/RGB Video Gamma Level to 2.22.
And if you’re using FC Studio 3, there’s really no good reason to continue rendering to the Animation codec. ProRes 4444 has greater bit depth, a lower data rate, and is supported by FCP’s Unlimited RT playback.
Joey Foreman
Editor/Compositor/VFX Artist