Alpha problem in DPX 2K 10-bit

We wish to deliver dpx files in 2K 10-bit [2048 x 1156] with an alpha channel
where 3D elements/characters. Basically, it would offer them better control in 
the DI 

When we Write a DPX from Nuke with the alpha activated in the write
node, the resulting image shows up on Avid DS-Nitris or Fusion is a black & 
white image with scanlines.In nuke it showing proper.

Is this a bug, is this not supported or are we just missing something.

In any case, what can we do to offer the best image quality to our client.

Note: On earlier projects when we were outputting to HD [1920 x 1080] we never
faced this problem with DPX files. We also tested tiff with alpha @ 16 bit 
[2048 x 1157] & DPX 2K in 8-Bit - both had no problems.



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