ID 323572 - Opening the Timeline Volume Slider in Nuke 11 on CentOS 6.# creates a black bar

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Problem summary
Opening the Timeline Volume Slider in Nuke 11 on CentOS 6.# creates a black bar

Customer reported version
nuke.11.0v2

Customer reported platform
centos6

Steps to reproduce

1) Open Nuke Studio 11 on CentOS 6

2) Create a new sequence and open it

3) Click and hold an audio track volume control, to open the Volume Slider

The slider will have a black bar below it.

Users have reported that this then turns the whole screen black, however support have not been able to reproduce.

Reproduced by support
This bug has been reproduced in:
Nuke 11.0v3 - CentOS 6.8, CentOS 6.9, Redhat 6.5
Nuke 11.0v1 - CentOS 6.8, CentOS 6.9, Redhat 6.5

Unable to reproduce bug in:
Nuke 11.0v3 - CentOS 7.2, Ubuntu 16.04, Windows 10, OSX 10.13
Nuke 11.0v1 - CentOS 7.2, Windows 10, OSX 10.13
Nuke 10.5v7 - CentOS 6.8, CentOS 6.9, CentOS 7.2, Windows 10, OSX 10.13

Earliest version tested
Nuke 10.5v7 - This issue no longer appears in this version and has regressed
Expected behaviour
For the volume slider to have the correct transparency around the UI

Actual behaviour
A black box surrounds the volume control
 

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