I have K3 hooked up to quad G5 and occassionally have the same problem. However, it only happens maybe once or twice a day (although I have had it happen over and over when I’m trying to output for a client!!). AJA always points to reference, but I think that is a cop out — my reference works with avids, and digibeta decks and beta decks, so I know the reference is good. If their card is so sensitive that it can’t accept legal reference, they should put out their own black gererator (or tweak the card so it can use the same reference that is good for every other piece of pro video!) I digress, basically, if you talk to Kona again, feel free to tell them that someone else has the same problem. If it is happening 1 of 3 plays, you should swap the card.