Hi Michael !
I see this effect also when I playback RAW Footage in REDCINE or ROCKETCINE that when panning or objects moving horizontal through the picture that there are horizontal disturbancies or strokes. It looks like that the progressive signal is not correct displayed on the computer monitors feeded from the graphics card. The SDI outputs are normal.
The interesting thing is, when I convert with Redrushes the horizontal strokes are nearly not visible.... so it looks like Redrushes makes a different signal in the DNxHD QT files than Rocketcine and Redcine.....
Any Hint ?