OK I've gone over all the threads and can't fix this issue. I have a 40 min sequence and in playing thru the A/V sync gradually drifts. once stopped and restarted sync is back on at first then begins to drift again. I've done everything I can think of. Kona is in a 4x Lane, Trashed preferences, reinstalled drivers, reinstalled QT, The guy at AJA told me to zap the p-ram so I did that. Nothing is working. Any other suggestions. I have the exact same configuration on 3 other FCP systems and they are not having this issue.