I'm using an Atomos Ninja Inferno and cannot play my 4K DNxHD recorded files in Vegas 13 or the Vegas 15 trial. I have the Avid codecs LE installed on my system. Is this format not compatible with Vegas?
I'd say the Atomos display is wrong then and it is DNxHR. You would need to have DNxHR installed then but if it is MXF wrapped I doubt it will work in Vegas Pro.