ID 491881 - Nuke crashes when a Read node's displays an error in the Viewer (Windows)

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Problem summary
Nuke crashes when Read nodes display an error in the Viewer.
The issue appears to only happen on Windows 10.

This can happen when a Read node's colorspace cannot be found in the current OCIO config, or when reading an MPEG4 or h264 file into Nuke Non-Commercial.

Customer reported version
Nuke 13.0v5

Customer reported platform
Windows 10

Steps to reproduce

1) Open Nuke.

2) Navigate to Edit > Project Settings and open the Color tab.

3) Ensure that color management is set to Nuke and OCIO config is set to nuke-default.

4) Create a Read node, and select any footage. At this point, the file should be read in as expected.

5) On the Read node, change the colorspace knob to any value, other than the default.

6) Now set color management to OCIO and the OCIO config knob to either aces_1.1 or aces_1.0.3.


Alternative reproduction steps

1) Open Nuke Non-Commercial.

2) Read in a MPEG4 or h264 file.


Expected behaviour
Nuke should not crash, and should display an error for the Read node.

Actual behaviour
Nuke crashes when Read nodes display an error in the Viewer.

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
Nuke 13.0v5 - Windows 10 - Regression

Unable to reproduce bug in:
Nuke 13.0v5 - Linux CentOS 7 - macOS 10.15 (Catalina)
Nuke 13.0v4 - Windows 10

Earliest version tested
Nuke 13.0v4
- This issue doesn't appear in this version and has regressed

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