Tracked the colour of the flash down to:
plugins/opengl/src/screen.cpp:GLushort defaultColor[4] = { 0xffff, 0xffff, 0xffff, 0xffff };
Changing that colour changes the colour seen with this bug. So it would seem that when this bug occurs, it means the decor plugin has somehow failed to texture the window decorations and just fills the decorations with the default fill colour.
Tracked the colour of the flash down to: opengl/ src/screen. cpp:GLushort defaultColor[4] = { 0xffff, 0xffff, 0xffff, 0xffff };
plugins/
Changing that colour changes the colour seen with this bug. So it would seem that when this bug occurs, it means the decor plugin has somehow failed to texture the window decorations and just fills the decorations with the default fill colour.