Render artifacts like electric blue contour maps

[nigelsmith]

Hi
I have some shots of autumn leaves that I have been rendering out from Redcine as DNXHD QTs. They look fine in Redcine, but in QT player and in the Avid they appear to have pale blue contour map type shapes superimposed on them.
I don't see them when I use Clipfinder to render QTs.
I have tried turning off all OLPF sharpness and setting quality to 'high' and to 'medium'. I have not made any colour adjustments to the clips.
Any ideas?

 

[nigelsmith]

I'm still getting this problem with blue/purple artifacts. See here for an example:

http://3.bp.blogspot.com/_qXgGaISUk9I/SxaNBolMzHI/AAAAAAAAAno/wFV7erPIEZ8/s1600-h/Picture+2.png

Files are rendered out of Redcine as DNXHD185x.
Can anyone help?