Setting the bit rate at all seems to be what is helping. The number seems irrelevant. This setting process seems to be re-calibrating something. Something new. We are looking into this. As previously mentioned, We are working with Apple on a support ticket. Once we have some indication of what has changed with them since Mavericks/QuicktimeX, etc we can move ahead. The help our users are giving here is very much appreciated. Definitely keep sharing your findings. Thank you!