Icons missing in Writer

I have just installed LibreOffice Fresh 5.1.0 and started using Writer.
At random, the icons disappear, but can be brought back by moving the mouse over the Iconbar, which sort of “colours them back in”.

image:! /C:\Users\Admin\Pictures/Writer Icons Missing.JPG

Clean install of Windows 10 (new PC)

Has anyone else seen this odd behavior?



Likely another OpenGL issue e.g., tdf#97816.