I’ve had the same problem for quite a while now – most annoying. Ever since upgrading to 10.4 and FCP 5. We suspect our AJA KONA2 card cuz it doesn’t happen on our other 2 suites which are BlackMagic DeckLinks. We are now on FCP 5.0.3, MacOS 10.4.2 and QT 7.0.3
Tim Webster