[fixed] 'Choose color' dialogue crashes (Win10 -64)

[greytery]

Open Edit Preferences Dialogue.
The 'Choose Color' dialogue crashes when attempting to move slider control bar.
Results in Windows error pop-up:
"erl.exe has stopped working.
A problem caused the program to stop working correctly.
Windows will close the program and notify you if a solution is available"
Close program

Changing the R/G/B numerical values in the dialogue window is OK.
'Choose Color' dialogue only appears for a sub-set of the color options:
General.Vertex Display.Magnet Mask
General.Information text.Background
User Interface.Colors.Title (Active) Background
User Interface.Colors.Title (Passive) Background
User Interface.Colors.Menubar Background
User Interface.Outliner/Geometry Graph{+AdaptiveIcons}.Colors.Background.

Other color options use the older(?) 'Color' dialogue (no sliders ).

Cannot see where - if at all - Windows has stored a diagnostic log file.

{Been away a long time. Thought I'd try V2 on Win 10 64bit. Easiest/cleanest app install so far! Looking really good!}

tery