Having only just been inflicted with the green screen misery I tried both your suggestions but neither worked.
My MacBook Pro at home doesn’t have the same problem. At work the only difference is that we have a BlackMagic video card.
Eventually I took the last poster’s suggestion that it was Apple Pro Res that was at fault. So I changed the FCP Sequence settings’ codec to Photo JPEG. This solved the problem.
It it very surprising that Apple’s own codec should not work with its own programs.
MacPro 10.5.5
FCS 2 (FCP 6.06 + Motion 3.02)
BlackMagic Multibridge Pro
+
MacBook Pro 2.16GHz Core Duo (not Core 2 Duo!)
Same software