ID 249977 - Artefacts are randomly generated when a Erode/Dilate node is placed after a Roto node

Problem summary
Artefacts may be generated when a Erode/Dilate node is placed after a Roto node (on Windows)/

Customer reported version
nuke.10.0v5

Customer reported platform
windows7

Steps to reproduce

1) Open the attached script: Support_Example.nk

2) Write out a .mov file from the script

3) Read back in the .Mov file and view frame by frame

4) Line artefact will appear across the shape on some frames (changes each render)
Note: In the screenshots below, the same file is being read and was not rewritten but the artefacts appear on different frames. This appears to be an issue with the viewer.

 

 

Workaround
Adding adjustBBox or crop nodes to extend the bounding box seem to fix the problem

Reproduced by support

Nuke 11.0v1 - Windows 10
Nuke 10.5v5 - Windows 7/10 
Nuke 10.5v1 - Windows 7/10
Nuke 10.0v6 - Windows 10
Nuke 10.0v1 - Windows 10
Nuke 9.0v9 - Windows 10
Nuke 9.0v1 - Windows 10
Nuke 8.0v7 - Windows 10
Nuke 8.0v1 - Windows 10
Nuke 7.0v10 - Windows 10

 

Sporadic to reproduce. Unable to reproduce on OSX 10.12.4 or CentOS6

Expected behaviour
No artefact shape should appear in the render.

Actual behaviour
Black lines across the white areas in the render on some frames.