ID 238487 - Artifacts in viewer and possible crash when the 'mix luminance' option is enabled in the 'Grade' node in this specific script

Problem summary
Artifact lines in viewer and possible crash when the 'mix luminance' option, in the 'Grade' node, is enabled in this script. Addtionally changing several colour values causes a crash in later Windows builds.

Customer reported version
nuke.10.0v1

Customer reported platform
fedora

Steps to reproduce

1) Copy/Paste the following script into Nuke:

----------------------------------------------------

set cut_paste_input [stack 0]
version 10.0 v1
CheckerBoard2 {
inputs 0
centerlinecolor 0.18
name CheckerBoard2
selected true
xpos 205
ypos -318
}
set N93e4150 [stack 0]
Grade {
blackpoint 0.015
gamma 0.66
mix_luminance 1
name Grade1
selected true
xpos 127
ypos -190
}
push $N93e4150
Transform {
translate {{curve x1 0 x52 -400} {curve x1 0}}
center {3121 1217}
name Transform1
selected true
xpos 270
ypos -188
}
Copy {
inputs 2
from0 rgba.red
to0 backward.u
from1 rgba.blue
to1 backward.v
name Copy2
selected true
xpos 256
ypos -63
}
Shuffle {
in backward
name Shuffle1
label "[value in]"
selected true
xpos 256
ypos 22
}

---------------------------------------------------------------

2) Connect 'Viewer 1' to 'Shuffle 1' node. 

3) Open the Grade 1 properties and change some grade values.

4) Artifact lines appear on the checkerboard in viewer

5) Change some additional random values, Nuke may crash

6) Change the 'mix luminance' value, Nuke may crash

Workaround
Unknown.

Reproduced by support

Crashes only occur after Nuke 10.5v1 on Windows, but scanline errors are appearing in all releases.

Nuke 10.5v5 - Windows 7 (Crash) - MacOSX 10.12 - CentOS 6.9

Nuke 10.5v4 - Windows 7 (Crash) - MacOSX 10.12 - CentOS 6.9

Nuke 10.5v1 - Windows 7 (Crash) - MacOSX 10.12 - CentOS 6.9

Nuke 10.0v6 - Windows 7 - MacOSX 10.12 - CentOS 6.9 (Crashes on all OS)

Nuke 10.0v1 - Windows 7 - MacOSX 10.12 - CentOS 6.9 (Crashes on all OS)

Nuke 9.0v1 - Windows 7 - MacOSX 10.12 - CentOS 6.9 (Crashes on all OS)

Nuke 8.0v7 - Windows 7 - MacOSX 10.12 - CentOS 6.9 (Crashes on all OS)

Expected behaviour
No artifacts lines in the viewer over the checkerboard. No crash if the 'mix luminance' value/various colour changes are made.

Actual behaviour
Artifact lines in viewer over the checkerboards. Nuke crashes if the 'mix luminance' value/various colour changes are made.