ID 241883 - VectorDistort is outputting all black for the top row of pixels

Problem summary
VectorDistort is outputting all black for the top row of pixels

Customer reported version
nuke.10.0v1

Customer reported platform
n/a

Steps to reproduce

1)
Read an image

2)
add a SmartVector node and specify a file and render the vectors

3)
add a VectorDistort, connect the Src to the Read image and the SmartVector input

4)
view the top row of pixels output from VectorDistort and compare to the the original Read image.


Workaround
Unknown. 

Reproduced by support
Nuke10.0v4
OS 10.10.5

Expected behaviour
view the top row of pixels output some values other than rgba={0,0,0,0}

Actual behaviour
top row of pixels output , rgba={0,0,0,0}