Thank you very juch for your answer… but…
1. I am using OS 10.3.9
2. I am viewing using an external NTSC Broadcast monitor
3. I have rendered everythng. Even went as far as deleting all the render files and re-rendering
4. Show overlays is unchecked
And last, but not least, as I said, it also looks bad on the exported quicktime.
Do you have any other ideas?