ID 335005 - Selecting a colour from the Foreground swatch will cause Mari 4 to hang

Problem summary
Selecting a colour from the Foreground swatch will cause Mari 4 to hang on Wacom MobileStudio Pro

Customer reported version
4.0v2
Customer reported platform
windows10

Steps to reproduce

1) Launch Mari 4 on the Wacom MobileStudio Pro

2) Open Example Head

3) Open the Colors palette from the Palettes Toolbar or (View > Palettes > Colors)

4) Select any colour and then close the palette.

5) Click on the Foreground Color swatch to select a colour.

6) Mari will hang and need to be killed via the Task Manager

Workaround
Unknown. 

Reproduced by support
Mari 4.0v2 - Wacom Mobile Studio - Windows 10
Mari 4.0v1 - Wacom Mobile Studio - Windows 10

Unable to reproduce bug in:
Mari 3.3v1 - Wacom Mobile Studio - Windows 10

Earliest version tested
Last working version - Mari 3.3v1
Expected behaviour
Mari should not hang when selecting a colour via any method or swatch.

Actual behaviour
Mari hangs when the colour palette opens rendering you unable to select a colour and hindering workflow