Thanks for the answer! The film is about 6 min long. The DNxHD codec is the Avid HD codec, much like Apples prores. I converted the file into a prores to se if it would work better with Toast but i had the same problem but now i see that the bit rate was really high on that one to. So i'm guessing the bit rate is the problem then, i'll export another file with a lower bit rate and see if that makes any difference.